Bifocal magnifier

Details Bifocal magnifier Bifocal magnifier

1997-10-11

1999-02-23

Mortimer, Paula A.

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

1606

Patent

active

D04061560

REFERENCES:
patent: D221118 (1971-07-01), Chambors
patent: D259445 (1981-06-01), Clarke
patent: 294171 (1884-02-01), Watts
patent: 1547142 (1925-07-01), Bausch
patent: 2176253 (1939-10-01), Fogarty
patent: 3409347 (1968-11-01), Vogel
patent: 3753610 (1973-08-01), Samuel
patent: 4457585 (1984-07-01), Ducorday
patent: 4984442 (1991-01-01), Benson

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