Combined holder and magnifier for gem examination

Details Combined holder and magnifier for gem examination Combined holder and magnifier for gem examination

1981-03-06

1983-11-08

Burke, Wallace R.

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

D1606

Patent

active

D02713080

REFERENCES:
patent: 42843 (1864-05-01), Ellis
patent: D135421 (1943-04-01), Austin
patent: D222980 (1972-02-01), Pike
patent: 2961108 (1960-11-01), Johnson
patent: 3410634 (1968-11-01), Buckner
patent: 3450458 (1966-06-01), Potrzuski
patent: 3830560 (1974-08-01), Onanian

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