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contact lens measuring rule
CONTACT LENSES AND ACCESSORIES
rule; slide rule
American Optical Co
North America: USA
Late 20th c.
plastic; vinyl
overall: 164 x 41 mm
2000.90
CONTACT LENSES AND ACCESSORIES
rule; slide rule
American Optical Co
North America: USA
Late 20th c.
plastic; vinyl
overall: 164 x 41 mm
Contact lens measuring slide rule and fitting guide. White plastic with transparent plastic slide. Slide marked on one side in red (plus lenses 0-20mm) and on other side in blue (minus lenses 0-20mm). Vinyl storage sleeve.
2000.90
Gift of Mr Philip Freeman, FCOptom, 2000