Dorr Felt builds the first successful key-driven…

1888 CE

Dorr Felt builds the first successful key-driven calculator.

Locations
Chicago Cook Illinois United States View →

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Dorr Felt View →

Groups
United States of America (US, USA) (Washington DC) View → Illinois, State of (U.S.A.) View →

Topics
Industrial Revolution, Second View →

Subjects
Invention View →

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