Gem holder for color evaluating

Details Gem holder for color evaluating Gem holder for color evaluating

1978-11-20

1980-12-09

Holtje, Nelson C.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

D1599

Patent

active

D02576171

REFERENCES:
patent: D92775 (1934-07-01), Sekine
patent: D106826 (1937-11-01), Dieffenbach
patent: D241042 (1976-08-01), Kupiec
patent: 1383646 (1921-07-01), Luckinbill
Popular Science, 5/8/44, p. 182, Feed Trough at bottom.

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