This 3M The Birth Of The Computer No 3 - 1850 4 page large format document was produced by 3M.
Date : June 1971
The focus is on D D Parmalee who patented a depress-able key mechanism and Dorr Eugene Felt who patented the Comptometer.
Early calculators by Leon Bollee, Monroe, Selling, Euklid, Odhner and the Aithmaurel are also feature with illustrations
This were kindly donated in the memory of the late Roy Pemberton who had previously owned them
Creator : 3M
This exhibit has a reference ID of CH11669. Please quote this reference ID in any communication with the Centre for Computing History.
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