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Chappell Datumset
MANUFACTURING AND DISPENSING EQUIPMENT
datum rule
Pell Optical Co
Europe: United Kingdom, England
c.1967
metal; plastic
overall: 72 mm x 187 mm

Silver-coloured metal rule. Printed scales on both sides. Straight scales on front; curving scales on reverse. Horizontal and vertical edge scales. Temple width gauge. Angular scale. Large graphical block. Segment diameter gauge. Apical radius scale. Two pegs in corners with remnants of sellotape adhesive around them.


1999.4174

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