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IGY Rule
MANUFACTURING AND DISPENSING EQUIPMENT
rule
Datum Optica
Europe: United Kingdom, England, Lancashire, Southport
1989
plastic, cardboard
rule: 65 x 170 mm; key: 90 x 209 x 403 mm
2004.634
MANUFACTURING AND DISPENSING EQUIPMENT
rule
Datum Optica
Europe: United Kingdom, England, Lancashire, Southport
1989
plastic, cardboard
rule: 65 x 170 mm; key: 90 x 209 x 403 mm
Optician's rule. Rhomboid shape. Transparent plastic. Together with stand-up key card, colour coded and featuring instructions for lens measurements, frame measurements and a practice photograph. The inset key serves also as a receptacle for storage.
2004.634
Gift of Mr Brian Mitchell, 2004