CALCULATORS History & Simulation	http://www.arithmeum.uni-bonn.de http://www.bluemich.net/rechner/ http://www.curta.de http://www.w-hasselo.nl/mechn/index.php http://www.hpmuseum.org http://www.jaapsch.net/mechcalc/index.htm http://www.johnwolff.id.au/calculators/Egli/Egli.htm http://mortati.com/glusker http://www.rechenautomat.de http://www.rechenhilfsmittel.de/index.htm http://www.rechenmaschinen-illustrated.com http://www.rechenwerkzeug.de http://www.rechnen-ohne-strom.de http://www.rechnerlexikon.de http://www.xnumber.com/xnumber/mechanical1.htm http://www.mechrech.info/workmod/workmod.htm
NCR	http://www.brassregisters.com/ncr/NCRPage.htm
ADDIATORS &  Simulation	http://www.addiator.de
SLIDE RULES Manuals & Simulation	http://www.rechenschieber.org http://www.sliderulemuseum.com http://www.sphere.bc.ca/test/sruniverse.html http://sliderule.ozmanor.com/man/man-download.html http://www.rechenwerkzeug.de/download.htm http://www.antiquark.com/sliderule/sim/n4es/virtual-n4es.html http://www.sliderules.info/index.htm
PORTABLE TYPEWRITERS	http://willdavis.org/ http://www.portabletypewriters.co.uk http://site.xavier.edu/polt/typewriters/
TELEPHONES	http://www.PHONECOinc.com
impressum	http://public.BHT-Berlin.de/hamann                                         ( 07 / 10 / 2022 )