| Dalton Adding Machine |
 |
| "The Dalton was the first ten key
adding machine and was introduced in 1902. It went on to
become one of the most popular 10 key adders of the time.
Earlier models had glass inserts to allow customers to
view the gears actually calculating the answers. By the
1920's over 150 models of Dalton had been designed."
info@thisoldeoffice.com |
| Source:
This
Olde Office |