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depressed diagram encyclopedia end figures guide hammer harmsworths key lever machine mechanism one plates pressed principle printed raised showing spring struck total type universal vintage workingVintage Diagram Of A Calculating Machine 1900s. Editorial Image
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Title
Vintage diagram of a calculating machine 1900s. #210243814
Description
Harmsworth`s Universal Encyclopedia 1940s.Calculating Machine: Diagram showing the principle of a calculating machine. Lever bears at one end type blocks with figures 0 - 9, guide plates. Key is depressed and type blocks are raised and struck by spring hammer and printed when the total button is pressed. Working mechanism of a calculator 1900s.
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