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The New Optrex Datum Rule
MANUFACTURING AND DISPENSING EQUIPMENT
datum rule
John Baird & Sons
Europe: United Kingdom, Scotland, Lanarkshire, Glasgow
1930s
plastic; metal
overall: 203 mm x 100 mm

White plastic datum rule, marked with black scales complete with its parallel bars.


2010.702

Gift of Mr Ronald Rabbetts, FCOptom, DCLP, 2010



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