FAQs = README !

       INTRODUCTION RECHENMASCHINEN (English / German )

       TOUR ASTRA ... WARD


      C  O  N  T  E  N  T  S   of the "On-Line Museum"
   =====================================================
   *  THE   C A L C U L A T O R   COLLECTION
      o  Calculators
         (in alphabetic order)
      o  Small Adders
      o  Counting Savings Bank
      o  Counters
      o  Addiators
      o  WorkShop
      o  Trickies
      o  Diagrams
      o  History
   *  Abacuses
   *  Napier Sticks
   *  THE   S L I D E   R U L E   COLLECTION
   *  Tables
   *  Curve Meters
   *  Planimeters
   *  My Engineering Tools
   *  Pantographs
   *  Proportional Divider
   *  Rulers
   *  Calipers
   *  Micrometers
   *  Pedometers
   *  THE   S C A L E S   COLLECTION
   *  THE   T Y P E W R I T E R   COLLECTION
   *  Telegraphy
   *  THE   T E L E P H O N E   &   M U L T I M E T E R   COLLECTION
   *  THE   C L O C K   &   W A T C H   COLLECTION
   *  SlotMachines
   *  » T h e   O t h e r   W o r l d «
   *  Links


A   S T R U C T U R E D     O V E R V I E W               06/16/13
******************************************************************
Cliff & Me

THE  C A L C U L A T O R  COLLECTION

ADDO
   MULTO-13
      Inside Views / Snapshots of the Restoration Procedure

ASTRA
   ASTRA (E)
      Inside View / Snapshots of the Restoration Procedure

BELL-PUNCH
   PLUS 906

BRUNSVIGA
   BRUNSVIGA 10
   BRUNSVIGA 11E
      Inside View - Proof for "Retro Design"
   BRUNSVIGA 13RK
   BRUNSVIGA 13RM
      On-line Manual

BURROUGHS
   Class 1 Model
      Inside Views / Snapshots of the Restoration Procedure
   Class 3 Model
 ( How to remove the cover  &  How to make a »B-Key« )
   Class 5 Model
   Class 8 Model
   Class 9 Model

COMPTOMETER
   COMPTOMETER Model H
   COMPTOMETER Model J
   COMPTOMETER Model 99C (Electric!)

CONTEX
   CONTEX-A
   CONTEX-B
   CONTEX-10 ( Snapshot of the Restoration Procedure )
      CONTEX-10 ( Newer Version )
   CONTEX-20
   CONTEX-30
   CONTEX-55

CURTA
   CURTA-1
      CURTA-2

ELITE
   ELITE 100-7/8

FACIT
   FACIT EK
   FACIT NTK
   FACIT C1-13
      Inside Views / FACIT's SPECIAL(Pin-Wheel)SOLUTION
   FACIT CM2-16
   FACIT CA1-13
      Inside Views / Snapshots of the Restoration Procedure

FELIKS
   FELIKS M
      Inside View

HAMANN
   README - New Definitions / Identifications
      HAMANN-MANUS "Model-D" Experiment
   HAMANN-MANUS-C
   HAMANN-MANUS-D
      Inside Views / Snapshots of the Restoration Procedure
   HAMANN-AUTOMAT-S
      Inside Views
      Hand-Made "Crank"
         HAMANN-AUTOMAT-S (2nd Version)
            Snapshots of the Restoration Procedure

KOMET
   KOMET TA 8/9
      Inside Views / Snapshots of the Restoration Procedure

MARCHANT
   MARCHANT (B) STANDARD
      Inside Views / Snapshots of the Restoration Procedure
   MARCHANT H9
      Inside Views + ADAPTING SEGMENT PRINCIPLE

MELITTA
   MELITTA VI/16

MERCEDES
   MERCEDES-EUKLID 22
      Inside Views / Snapshots of the Restoration Procedure
   MERCEDES-EUKLID 29
   MERCEDES-EUKLID 38 MS
      Inside Views / Snapshots of the Restoration Procedure
   CELLATRON R 31
      Inside View / Design Procedure for an ACRYLIC COVER ...

THE MILLIONAIRE
   THE MILLIONAIRE
      Restoration Project:  MAKE ONE-OUT-OF-TWO

MONROE
   Model LX-160
      Model LX-160 (Newer Version)
   Model 1
      Model 1 (Older Version)
         Inside Views / Snapshots of the Restoration Procedure
      Model 1 (Newer Version)
   Model CSAE-10
   MONROmatic CAA-10
   MONROmatic 8N-213
      Slide Show: "Insight of the Inside"
      Manual
   Model 811-H4 (Made by OLYMPIA)
      How the ribbon is spooled

NCR
   NATIONAL CASH REGISTER Model 313
      Inside Views / Snapshots of the Restoration Procedure

NISA
   NISA-K2
      NISA-K5 (Plastic)
      NISA-K5 (Metal)

NUMERIA
   NUMERIA Model 8213
      Inside Views / Snapshots of the Restoration Procedure

ODHNER
   ORIGINAL-ODHNER Model 7
      Inside Views / Snapshots of the Restoration Procedure
   ORIGINAL-ODHNER Model 27
   ORIGINAL-ODHNER Model 239

OLIVETTI
   SUMMA PRIMA 20
   DIVISUMMA-26-GT
      Inside Views / Snapshots of the Restoration Procedure

OLYMPIA
   OLYMPIA 1182
   OLYMPIA-AE
   OLYMPIA RAS-12

PRECISA
   PRECISA 128-1-E
   PRECISA 208-10
   PRECISA 164-12

PRODUX
   PRODUX MULTATOR

REMINGTON-RAND
   REMINGTON (Basic Version)
      REMINGTON (Visible Counter Version)

RESULTA
   RESULTA-BS7
   RESULTA-7
   RESULTA-9 »Export«
      RESULTA-7 »Export«
   RESULTA-P7 with Printer
      Inside View
      RESULTA-P9 with Printer

SCHUBERT
   SCHUBERT
      Inside Views / Snapshots of the Restoration Procedure

SUMMIRA
   SUMMIRA-7
      SUMMIRA-7 with Printer

THALES
   THALES MEZ
      Inside Views / Snapshots of the Restoration Procedure
      THALES CER

T.I.M.
   T.I.M.
      Inside Views / Snapshots of the Restoration Procedure

TORPEDO
   TORPEDO

TRIUMPHATOR
   TRIUMPHATOR CN1
      Inside View / Snapshots of the Restoration Procedure 
   TRIUMPHATOR CRN1
      Inside View / Snapshots of the Restoration Procedure 
   TRIUMPHATOR CRN2

VICTOR (All with Printers)
   Manual Operated Full-Keyboard Models:
      OldModel
      Compact
      Economy
      ArtDeco (6 Digit Model)
      ArtDeco (8 Digit Model)
   Manual Operated 10-Block-Keyboard Models:
      ArtDeco (OlderVersion)
      ArtDeco (NewerVersion)
      Tallymaster
         Inside Views / Snapshots of the Restoration Procedure
   Motorized Full-Keyboard Models:
      ArtDeco
      Custom
      NewerVersion
      US/GB-NonMetric
   Motorized 10-Block-Keyboard Models:
      ArtDeco
      Custom
      Economy
      Automatic-73
      Automatic-74
   McCASKEY / VICTOR CashRegister
         Inside Views / Snapshots of the Restoration Procedure

WALTHER
   RK
   WSR-160
   COMPTESS
   MULTA-GT
      Inside Views / Snapshots of the Restoration Procedure
   DIWA-32
      Inside Views / Snapshots of the Restoration Procedure

WARD
   MONTGOMERY-WARD 7/8


SMALL ADDING MACHINES
   ADDI-7
   ADDOMETER
   AS7
      REGINA-7
   CHADWICK
   COMPTATOR
   LITTLE GIANT
   ADDING MACHINE ( Toy Version of the "LITTLE GIANT" )
   GOLDEN GEM
   KEN+ADD
   LIGHTNING
   PASCAL-TYPE
   PRECISE
      Inside Views / Snapshots of the Restoration Procedure
   SWIFT
   THALES »KA«
      Inside Views / Snapshots of the Restoration Procedure
   TRIUMPHATOR »KA«
      Inside Views / Snapshots of the Restoration Procedure
   TOY ADDING MACHINE


COUNTING SAVINGS BANK
   UNCLE SAM'S 3COIN REGISTER BANK


COUNTERS
   Manual Event Counter
   Assembly-Line Counter
   Telephone Toll Counter
   Electro-Mechanical, Resetable Counter
     Application:  Pulsar + Counter = Clock
   Shopping COUNTER / Calculator »INSTAMATIC«
   BATES Numbering Machine


ADDIATORS

   How to Use an ADDIATOR

   RELIABLE ADDER
   VE-PO-AD
   TASCO
   ADDIATOR PERPLEX
   ADDIATOR DUPLEX
   ADDIATOR TRIPLEX
   ARITHMA & ADDIATOR-UNIVERSAL
   CORRENTATOR
   PRODUX-ORIGINAL
   EFZET
   PRODUX / RECORD
   RECORD
   UNIS
   ADDIFIX-6
   BABY CALCULATOR ( Black Version )
   BABY CALCULATOR ( Silver Version )
   MAGIC BRAIN CALCULATORS
   OMEGA POCKET ADDING MACHINE
   KINGSON  Pound/Shilling/Pence Calculator
   SHERADCO Fraction of an Inch Adding Machine


W O R K S H O P
   (A) ACTUAL RESTORATION & REPAIR QUEUE
         ...

   (B) INTERESTING REPAIRS & RESTORATIONS FOR OTHERS
      Calculators ...
         ALLEN-WALES_77
         BRUNSVIGA-11E
         BURROUGHS_CLASS-1 ADDING / BOOKKEEPING MACHINE
         CURTA-2
         FACIT_CM2-16
         FELIKS-M ("ZINC-PEST")
         HAMANN-300
         MELITTA_IV/16
         MILLIONAIRE
         MONROE_KA
         MONROE-"Model-1"
         MONROE_CSA-10
         TRIUMPHATOR-CN2
            Inside View / Snapshots of the Restoration Procedure 
         VICTOR_ART-DECO
      NonCalculators ...
         1907 MAGNETO WALL PHONE
         MultiMeter » μA-MULTIZET «
         MultiMeter » EXACTA «
         R-L-C Wheatstone Bridge ( transistorized )
         JEPPESEN Flight Computer CSG-9   
         1900 SESSIONS MANTEL CLOCK 
         1850 BAROQUE MANTEL CLOCK 

   (C) UNSUCCESSFUL PROJECTS
         ALLEN-95
         MARCHANT-8ADX
         VICTOR AUTOMATIC-75

   (X) T E A C H I N G   PROJECTS
         MULTIMETER RECYCLE PROJECT ( English / German )
         3-Way- / 4-Way-Switch ( How-To-Do vs. How-To-Know )


TRICKIES
   of Mechanical Calculating
   
   Shortened Method of Multiplication
   Shortened Method of Calculating Discount & Net Sum
   Multiple Divisions with the same Divisor
   Division (Additive Method; Division by Multiplication)
   Chain Multiplications with Back-Transfer
   Chain Multiplications without Back-Transfer
   Multiplication involving Addition of Products
   Cubes without Back-Transfer
   Calculating Square Roots
      1st Method ( Toepler )
      2nd Method ( Herrmann )
   Simultan. Calculating Sum & Sum of Squares in CURTA-2


DIAGRAMS
   of Calculator Mechanisms
   
   Stepped Drum / Staffel-Walze
   Pin Wheel / Sprossen-Rad
      FACIT-Version
   Comptometer Section
   Split Stepped Drum / Geteilte Staffel-Walze
   10s Carry Mechanisms
      Split-Stepped Drum / MONROE Type
      Pin Wheel / ODHNER Type
   Counter Stepping Mechanism
   Counter Stepping Animation
   Adapting Segment / Stell-Segment
   Proportional-Lever / Proportional-Hebel
   Linear Segment Mechanism
      Caliper / Nonius
   Switching-Latch Wheel / Schalt-Klinke
   Rocking Segment Mechanism
   10-Key Adding / Printing Calculators
   MILLIONAIRE / "1x1-Koerper"


HISTORY
   of Inventors & Calculator Companies
   
   Addiator
   Addo
   Astra
   Bell-Punch
   Brunsviga
   Burroughs
   Comptometer / Felt & Tarrant
   Contex
   Curta
   Facit
   Feliks
   Hamann
   Lipsia
   Marchant
   Melitta
   Mercedes
   Monroe
   National / NCR
   Nisa
   Odhner
   Olivetti
   Olympia
   Precisa
   Produx
   Remington-Rand
   Resulta
   Schubert
   Summira
   Thales
   Torpedo
   Triumphator
   Victor
   Walther
   Ward


ABACUSES

   How to Use an Abacus
   ... as a HEXA-DECIMAL Calculator


   China (2+5)*13 Beads
      A Paper-Weight Chinese Abacus
      A Decorative Chinese Duplex-Abacus
   Japan (1+4)*23 Beads
      Japan (1+4)*17 Beads, Aluminum-Frame, Resetable
   Japan (1+5)*27 Beads
   Japan (2+5)*13 Beads
   Russia 10*10 Beads
   Germany 10*10 Beads


NAPIER
   NAPIER's BONES / "Sticks" Self-Made


THE  S L I D E   R U L E  COLLECTION
   DOWNLOAD  the  »COPY,CUT&FOLD« - PAPER SLIDE RULE

   The Principle of Slide Rules

C O L L E C T I O N  ...

      Acu-Math
      Aristo
      AWF
      Concise
      Citizen
      Dietzgen
      Diwa
      Ecobra
      Faber-Castell
      Fowler
      Fullerton
      Gilson
      Graphoplex
      Hemmi
      Hoehler
      Hughes-Owens
      IWA
      Keuffel & Esser
      Klawun
      Lawrence
      Logarex
      Lutz
      Mantissa
      Meissner
      Nestler
      Norma
      Otis-King
      Pickett & Eckel
      Post
      Reiss
      Sanderson/Jeppesen
      Scientific Instruments
      Staedler
      Sterling
      Tavernier-Gravet
      Troeger
      Unis
      USSR
      Uto
      Wichmann

C O N T E N T S :
   
   Introduction

   Linear Common Slide Rules
   Non-Linear Common Slide Rules
   Special Slide Rules  &  Slide Calculators
   Teaching Slide Rules
   
   Use of Special Scales on Common Slide Rules
   Common Marks on Cursors
   Marks on Slide Rules and their Meaning
   History of Slide Rule Inventors
   Historical Remarks to Slide Rule Companies
   Some Slide Rule Books


MATHEMATICAL TABLES
   E.Jahnke & F.Emde
   F.G.Gauss
   M.Abramowitz & I.A.Stegun


CURVE METERS
   ALVIN Curve meter
   CHARVOZ Curve Meter
   NoName Map Meter


PLANIMETERS
   Theory of Planimeters

   FOREST SERVICE Planimeter
   KEUFFEL & ESSER Planimeter
   LASICO Planimeter Model 121-A
   WICHMANN Planimeter Nr.1192
   WICHMANN Planimeter Nr.90


My ENGINEERING TOOLS from the 60s ...


PANTOGRAPHS
   How a PANTOGRAPH (= "StorchSchnabel", MARABU-1) works ... 
      A "Professional" NESTLER-2490 PANTOGRAPH


PROPORTIONAL DIVIDER
   How a PROPORTIONAL DIVIDER works ... 


RULERS
   Inch vs. Metric !!!


CALIPERS
   HELIOS / Nonius ( AEG Unterweisung )
      METRIC CALIPER / Circular Scale
      DECIMAL-DIVIDED INCH CALIPER / Circular Scale
      HEMA / Special Caliper


MICROMETERS
   CARL ZEISS Mechanical ANALOG Micrometer
   MITUTOYO Mechanical DIGITAL Micrometer
   LUFKIN Mechanical ANALOG Micrometer (USA-Version)


PEDOMETERS
   K&R Pedometers/StepCounters
   ARISTO Pedometer/StepCounter


THE  S C A L E S  COLLECTION
   Theory - How mechanical Scales work

   Toy Scale + Polygones
   Person Scale
   Metric Kitchen Scale + Metric Weight Box
   Kitchen Scale + Hydraulic Mini-Jack
   Mini (Spring) Kitchen Scale + 3D-MOEBIUS-RING
   Precision Metric Triple-Beam-Balance Scale
   Common Letter Scale + KLEINBOTTLE
   Bilateral Letter Scale
   Travel Letter Scale
   METTLER »H15« Lab Scale + "How-It-Works"
      Inside Views / Snapshots of the Restoration Procedure


THE  T Y P E W R I T E R  COLLECTION

   PORTABLES

      HAMMOND » NO.12 « ( "luggable" )
      AEG » MIGNON « (Pointing Typewriter)  >----- 1st ------+
         Inside View                                         |
      ADLER » FAVORIT «  >---- 1st ----+                     |
         Inside View                   |                     |
      STOEWER » ELITE «                |                     |
      CORONA » 3 « FOLDABLE  >-- 1st ----------+             |
         CORONA » 3 « FOLDABLE (Newer Version) |             v
      UNDERWOOD » STANDARD «  >---------- 1st --------+  OLYMPIA
         Inside View                   |       |      |      |
      GRUNDKA  » MW «                  |       |      |      |
      REMINGTON                        |       |      |      |
      TRIUMPH  >-----------------------+       |      |      |
      OLYMPIA » ELITE «                |       |      v  ->--+
      ROYAL » TOUCH-CONTROL «          |       |  UNDERWOOD  |
      » RHEINMETALL «                  |       |      |      |
      S&N » ERIKA «                    |       |      |      |
      CONTINENTAL » WANDERER 50 «      |       |      |      |
      HERMES » BABY «                  |       v      |      |
      SMITH-CORONA » SILENT «          | SMITH-CORONA |      |
      ROYAL » Quiet DeLuxe «           |       |      |      |
      GROMA » GROMINA «                |       |      |      |
      OLIVETTI » LETTERA 22 «          |       |      |      |
         OLIVETTI » LETTERA 32 «       |       |      |      |
      K&K » PRINCESS 300 «             v       |      |      |
      OLYMPIA » DELUXE «        TRIUMPH-ADLER  |      |  ->--+
      OLYMPIA » SPLENDID 33 «          |       |      |  ->--+
      TRIUMPH » TIPPA «  <------ 50 ---+       |      |      |
         GOSSEN » TIPPA « - CHASSIS            |      |      |
      OLIVETTI » VALENTINE-S «                 |      |      |
      CONSUL  » Mod.231.3 «                    |      |      |
      OLYMPIA » DE LUXE 120 «                  |      |  ->--+
      OLYMPIA » TRAVELLER «                    |      |  ->--+
      SMITH-CORONA » GALAXIE DELUXE «          |      |      |
         SMITH-CORONA » CLASSIC-12 «  <-- 60 --+      |      |
      UNDERWOOD » 16 «  <---------------- 60 ---------+      |
      BROTHER » 440TR «                                      |
      OLYMPIA » TRAVELLER C «  <--------- 85 years later ----+

   Electrical OFFICE MACHINES

      IBM » SELECTRIC «
      IBM » SELECTRIC I «
      IBM » SELECTRIC II «


TELEGRAPHY
   Make a Telegraph Station out of a WESTERN ELECTRIC TEST UNIT
      WWII US Army/Navy FIELD TELEGRAPH SET » TG-5-B «
         Make a PARTNER STATION for the » TG-5-B «


THE  T E L E P H O N E  &  M U L T I M E T E R  COLLECTION

   Remarks to the Invention of the Telephone

   »Candlestick« WesternElectric (1920)
   ArtDeco Dial Phone AutomaticElectric (1920)
      Ringer/Warbler
   AutomaticElectric Model 40 Dial Phone (1937)
   Black Dial Phone WesternElectric Model 302 (1949)
   Blue Dial Phone AT&T Model 500 (1955)
   Pay Dial Phone AutomaticElectric (1948)
      Inside View
   Red Touch Phone WesternElectric Model 2500 (1965)
   PRINCESS Dial Phone WesternElectric (1964)
      External Transformer
   PRINCESS Touch Phone WesternElectric (1965)
   Red TRIMLINE Dial Phone WesternElectric (1965)
   Black TRIMLINE Touch Phone WesternElectric (1968)
   »FRENCH-STYLE« Dial Phone US Telephone Co. (1967)
   »CONTESSA« Dial Phone US Telephone Co. (1967)
   »PETITE« ITT-OWN-A-PHONE Dial Phone (1970)
   »CELEBRITY« WesternElectric Dial Phone (1975)
   Touch Tone Wall Phone (1978 / Restored 1983)
   ArtDeco Dial Phone PTT / Holland (1963)
   »W61« RFT (East-)German Dial Phone (1961)
      »W61« RFT WIRE DIAGRAM
         ANOTHER »W61« WIRE DIAGRAM ( ? STASI Tapping ? )
   TESLA Dial Phone / Czechoslovakia
   KRONE / Germany (1969)
   » How the DIAL SYSTEM works «
      A Closer Look
   GDR Field Telephones
   »KINDER-FON«-Box w. (West-)German Dial Phones (1948 & 1961)
   USA TEST Phone (1950)
      USA TEST Phone (1975)
      German TEST Phone (1981)
   Electronic KEYPAD TEST Phone
   Touch Phone H1-LX / Deutsche Telekom
   Touch Phone SIGNO-2 / Deutsche Telekom
   A PIANO Telephone
   A Dial-Telephone Lock
   Scale to measure Relais Contacts
   Mini-AC-Generator ( WWII / Germany )
   Portable Battery Element Tester
   Field MultiMeter METRAVO
   Lab S&H low-level DC Ampere-Meter
      Lab S&H DC Ampere-Meter
   Lab V/A-Meters S&H MULTIZET
      Lab DC-MultiMeter S&H μA-MULTIZET
   Zero-Center S&H MicroAmpere Meter 
   Zero-Center MilliAmpere Meter
      Application: DEMO-GENERATOR/MOTOR
   Portable JEWELL DC Volt Meter
   Portable WESTON Monitor AC-Meter Set
   Field MultiMeter SIMPSON-260
   Field MultiMeter ITT-METRIX MX-202
      Modification for 1.5 V Battery Replacement
   Field MultiMeter CHINAGLIA CORTINA
   HELIPOT Precision Potentiometers/Resistors
   Ohm-Meter GOSSEN TRIOHM
   Wheatstone Bridge H&B PONTAVI
   Inductance/Capacitance Bridge H&B INKAVI
   Portable MicroAmpere-Meter
   Portable S&H POST DC/AC Volt/Ampere-Meter
   Portable GOSSEN POST V/A-Meter
   Portable AEG Volt/Ampere-Meter
   Lab Precision S&H Watt-Meter (1900)
      A home-made Test-Unit for the S&H Watt-Meter
      Lab Precision S&H Watt-Meter (1970)


THE  C L O C K  &  W A T C H  COLLECTION

   Westminster Wall Clock
   Seth Thomas Clock (1863)
      Insights to Inside & Backside
   A German Cuckoo Clock
   GrandMa's Mantel Clock
   Schatz Ship Clock
   »ATMOS« Clock
      How the ATMOS works
   IMEXAL Calendar Mantel Clock
   » Mystery Clock «
   Quelle World Clock
      Motor Repair Procedure
   Kenwood Ham World Clock
   Kundo World Clock
   Kienzle World Clock
   Waltham Chronometer
   Stop Watches
      Hanhart / Germany
      Breitling / Swiss
      Camero [= HANHART / Germany ]  / Swiss
      Junghans / Germany
      Slava / USSR
   Elgin Pocket Watch
   Olma (Radioactive!) Wrist Watch
   Omega Automatic Wrist Watch
   Swatch Irony Automatic » Body & Soul «
   Citizen's "Navitimer"
   Sand Glass
   A Clock Riddle


SLOT MACHINES

   PACE  » DELUXE CHROME BELL «
      Inside View / Snapshot of the Restoration Procedure
   Slot Machine  »BONANZA«  Saving Bank
   Slot Machine  »BUCKAROO«  Saving Bank
   Slot Machine  MINI  Saving Bank


MECHANICAL MUSIC
   VICTOROLA Gramophone
   THORENS MusicBox with Metal Records
      Insights to Inside & History
   Yet another MusicBox from THORENS
   PIANOLA, A Mechanical Player Piano
      Inside Views


THE OTHER WORLD
   Other Collector Items from the Past

   Weather Station
   Kompass-Rose
   » GPS-Tools « from the 50s
   » Civil Engineer's NOTE PAD « from the 60s
   Universal All Angle Level
   Steam Tractor
      LangHolzWagen
      Steam Roller
         Restoration Procedure
   Toy Candle Boat
   Harmonica
   Xylophone
   Wind Chime
   Beer Bottles
   Coffee Mill
   Oil Lamp
   » Tropical Bug «
   Chess Game


LINKS
   to Other Interesting Web Sites
   
   GENERAL ( Information, History & Simulation )
   ADDIATOR ( & On-line Simulation )
   COMPTOMETER ( & On-line Simulation )
   CURTA ( & On-line Simulation )
   FACIT ( & On-line Simulation )
   NATIONAL CASH REGISTER
   MANUALS for OTIS-KING, FOWLER & more
   PORTABLE TYPEWRITERS

impressum:
******************************************************************
© C.HAMANN    http://public.beuth-hochschule.de/~hamann   06/16/13