Jaap Scherphuis | Golden Gem adding machine @jaapsch2 | Uploaded May 2017 | Updated October 2024, 4 minutes ago.
Here I show a Golden Gem chain adder from 1912.
See my collection of mechanical calculators on my site:
jaapsch.net/mechcalc
Here I show a Golden Gem chain adder from 1912.
See my collection of mechanical calculators on my site:
jaapsch.net/mechcalc