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American Optical Company
North America: USA, Massachusetts, Southbridge
overall: 401 mm x 253 mm
Selection chart for onepiece bifocal spectacle lenses, detailing distance power, disc side curve and reading addition, together with information on how to order the lens blanks and suggestions for surfacing them. Printed in black on one side only of a single large piece of paper, illustrated with diagrams, perhaps intended for wall mounting.