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Chappell Datumset
MANUFACTURING AND DISPENSING EQUIPMENT
datum rule
Pell Optical Co
Europe: United Kingdom, England
c.1967
metal
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. Small graphical block. Segment diameter gauge. Apical radius scale. Two pegs in corners.


1999.4173

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