8-column sterling controlled key duplex

 
8-column sterling controlled key duplex
4 0 c m
 
36cm
actual image size: 28cm x 32cm

Description

8-column sterling controlled key duplex comptometer, 1925-1927. Made by Felt & Tarrant Manufacturing Co of Detroit, USA. A comptometer is an early form of calculating machine.

© Science Museum / Science & Society Picture Library

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