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The Contex model B adding machine
Автор: Jaap Scherphuis
Загружено: 2017-11-12
Просмотров: 4415
Описание:
These simple adding machines were made by the Carlsen Brothers in Denmark - model A from 1946 to 1950, model B from 1951 to 1970.
For more information on this and other mechanical calculators in my collection, visit my website at https://www.jaapsch.net/mechcalc/ .
0:00 Introduction, history
0:51 Description
1:12 Clearing
1:28 Addition
2:29 No safety
3:41 Outro
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