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The Orthops Slide Rule - London Standards Committee Report
ARCHIVAL ITEMS
instructions
Raphael's Ltd
Europe: United Kingdom, England, London EC1
1920s
paper
overall: 228 mm x 137 mm
1999.4138/2
ARCHIVAL ITEMS
instructions
Raphael's Ltd
Europe: United Kingdom, England, London EC1
1920s
paper
overall: 228 mm x 137 mm
Instruction leaflet for an optician's rule. A5 format printed in dark blue on six sides, folded. Includes four drawn illustrations, catalogue entry and discount offer to opticians who return their old Orthops rules. Edges reinforced and front stamped by the Northampton Polytechnic.
1999.4138/2