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Orthops Rule
MANUFACTURING AND DISPENSING EQUIPMENT
slide rule
Raphael's Ltd
Europe: United Kingdom, England, London
20th c.
ivorine
overall: 54 mm x 229 mm

Ivorine rule. Ivorine frame-measuring rule. Printed both sides, featuring several scales. Fixed projection for taking height and projection of bridge. Series of cut-out curves for assessing shape and size of bridge. Includes apical radii curves.


1999.4139

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