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New 'Highway' rule
OPTOMETRIC INSTRUMENTS
rule
British American Optical Co Ltd
Europe: United Kingdom, England
20th c.
plastic

White plastic frame measuring rule. Various scales for most bridge and side measurements, with grids for placement of the frame in relation to the datum line. Two bevelled edges bearing straight millimetre scales, one starting at zero at one end, the other having zero in its middle and reading outwards in both directions.


1999.4145

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