Today back in 1887, patent #371,496 issued for the “comptometer,” the first adding machine “absolutely accurate at all times.” It was invented by Dorr Eugene Felt of Chicago; a model was constructed in 1884.
Search for Books & Articles:
See Also: Hours Weekly View
Reference Desk:
- Mon to Fri: 9am-5pm
- Sat: 11am-2pm
E-mail:
- General inquiries: wd.ref@ubc.ca
- Donations: wd.donations@ubc.ca
Contact Numbers:
- Info Desk: 604-822-2883
- More Numbers...
Reference and Research: