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MANUFACTURING AND DISPENSING EQUIPMENT
American Optical Company
North America: USA
overall: 100 x 242 mm
Promotional optician's rule and centration chart. Laminated white card, printed in colour, featuring on obverse: p.d. and bridge scales plus two schematic diagrams of an 'AO Compact' progressive lens. On reverse: Sliding lens selector with grey background.
Gift of Mr Brian Mitchell, 2004