Tray for quartz crystals

Details Tray for quartz crystals Tray for quartz crystals

1976-07-02

1977-09-06

Douglas, Alan P.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

D1599

Patent

active

D02457008

REFERENCES:
patent: D221688 (1971-08-01), Elsfelder
patent: 3877134 (1975-04-01), Shanahan

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