General Information History & Simulation	Mathematische Maschinen, Museum PH-Ludwigsburg http://www.bluemich.net/rechner/ http://history-computer.com/index.html http://www.hpmuseum.org http://www.rechenautomat.de http://www.rechenhilfsmittel.de/index.htm http://www.rechenmaschinen-illustrated.com http://www.rechenschieber.org http://www.rechnerlexikon.de http://www.sliderulemuseum.com http://home.vicnet.net.au/~wolff/calculators/welcome.htm http://www.webcom.com/calc http://www.w-hasselo.nl/mechn/index.php http://www.xnumber.com/xnumber/mechanical1.htm http://www.antiquark.com/sliderule/sim/n4es/virtual-n4es.html http://www.mechrech.info/workmod/workmod.htm
ADDIATOR & On-line Simulation	http://www.addiator.de
COMPTOMETER & On-line Simulation	http://members.cruzio.com/~vagabond/ComptHome.html http://www.webcom.com/calc/applets/felt/welcome.html
CURTA-Calculator & On-line Simulation	http://www.curta.de
FACIT & On-line Simulation	http://www.rechenautomat.de
NATIONAL NCR	http://www.brassregisters.com/ncr/NCRPage.htm http://www.daytonhistory.org/cash_learnmore.htm
MANUALS for OTIS-KING, FOWLER & more	http://www.sliderules.info/index.htm http://sliderule.ozmanor.com/man/man-download.html http://www.rechenwerkzeug.de/download.htm
PORTABLE TYPEWRITERS	The HomePage of RICHARD MILTON ... http://www.portabletypewriters.co.uk The HomePage of WILL DAVIS ... http://willdavis.org/
impressum	http://public.beuth-hochschule.de/~hamann