Bifocal lens or similar article

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1987-07-27

1990-09-04

Word, A. Hugo

Photography and optical equipment

Ophthalmic article

Lens

D16112, D29 9

Patent

active

D03103773

REFERENCES:
patent: D227819 (1973-07-01), Kotzar
patent: D280994 (1985-10-01), Abate
patent: 1482951 (1924-02-01), Stead
patent: 3614216 (1971-10-01), Rosenthal
X-Cel Optical Co. Catalog, p. 22.

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