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Hamblin Checking Chart (Optician's rule)
MANUFACTURING AND DISPENSING EQUIPMENT
rule
Theodore Hamblin Ltd
Europe: United Kingdom, England, London
1930s
cardboard; metal
overall: 177 x 228 mm
2000.355
MANUFACTURING AND DISPENSING EQUIPMENT
rule
Theodore Hamblin Ltd
Europe: United Kingdom, England, London
1930s
cardboard; metal
overall: 177 x 228 mm
Laminated paper-on-metal rule with black cardboard backing board. Features protractor and scales for deep PRO, PRO, Oval and half eye lens shapes. Printed instruction label pasted to reverse of backing board. Some slight foxing.
2000.355
Gift of Dollond & Aitchison Ltd, 2000