Variable grade level

Details Variable grade level Variable grade level

1980-12-23

1983-01-11

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 69, D1004

Patent

active

D02675510

REFERENCES:
patent: D132550 (1942-05-01), Scifres
patent: D171317 (1954-01-01), Von Duyke
patent: 346519 (1886-08-01), Tybjerg
patent: 886333 (1908-04-01), Southward
patent: 899269 (1908-09-01), Staley
patent: 922960 (1909-05-01), Schatz

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