Level

Details Level Level

1975-04-17

1977-06-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02448378

REFERENCES:
patent: 1159522 (1915-11-01), Miller
patent: 1264484 (1918-04-01), Bridgman
patent: 1278148 (1918-09-01), Heusser
patent: 2633640 (1953-04-01), Rucsko
patent: 3311988 (1967-04-01), Manville
patent: 3435533 (1969-04-01), Whitfield

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