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card rule
MANUFACTURING AND DISPENSING EQUIPMENT
rule
Newbold & Co Ltd
Europe: United Kingdom
1st half 20th c.
paper
overall: 150 x 64 mm

Optician's rule. White card printed in black. Various scales on both sides including length to bend, temple width, height of bridge, height of segment, lens size, DBL and mean bridge spreads.


2001.208

Gift of the City University, 2001



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