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Orthops slide rule
MANUFACTURING AND DISPENSING EQUIPMENT
slide rule
Raphael's Ltd
Europe: United Kingdom, England, London
2nd quarter 20th c.
ivorine; metal
overall: 82 mm x 173 mm

Ivorine and white metal slide rule. Printed both sides, featuring several scales.


1999.2169

Gift of Lancaster & Thorpe, 1998



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