Jaap Scherphuis | Beaver adding machine @jaapsch2 | Uploaded July 2022 | Updated October 2024, 7 minutes ago.
The Beaver is a very rare adding machine that was made in Japan in 1964. It was exported and sold by Ito-Ya Ltd., a stationery supplies company.

For more information on this and other calculating machines in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:28 History
1:44 Addition
2:42 Subtraction
4:25 Clearing
4:48 Complementary numbers
5:48 Opening case
8:35 Mechanism
11:02 Outro