Example of Hansen's Writing Ball patented 1
3 3 c m
40cm
actual image size: 32cm x 25cm

Example of Hansen's Writing Ball patented 1

© Science Museum / Science & Society Picture Library

Description

Example of Hansen's Writing Ball patented 1870- 1875, a typewriter with keys radiating to a common printing point
 

Image Ref.

10233398
 

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