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'AO Compact' slide rule chart
MANUFACTURING AND DISPENSING EQUIPMENT
centration chart
American Optical Company
North America: USA
1998
plastic
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.


2004.437

Gift of Mr Brian Mitchell, 2004



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