Magnifier

Details Magnifier Magnifier

1989-06-06

1992-02-18

Burke, Wallace R.

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

Patent

active

D03240606

REFERENCES:
patent: D109322 (1938-04-01), Hummel
patent: D117128 (1939-10-01), Pike
patent: D118929 (1940-02-01), Friedman
patent: D163349 (1951-05-01), Baratelli
patent: D217506 (1970-05-01), Knoetgen
patent: D269275 (1983-06-01), Tweedie
patent: 4903706 (1990-02-01), Vila-Cora et al.

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