Level rule

Details Level rule Level rule

1984-01-30

1986-09-23

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 71, D10 69

Patent

active

D02857804

REFERENCES:
patent: D14043 (1883-07-01), Stephens
patent: D189590 (1961-01-01), White
patent: D212340 (1968-10-01), Hull
patent: D229341 (1973-11-01), West
patent: D238056 (1975-12-01), Foster
patent: D267552 (1983-01-01), Seely
patent: 2736097 (1956-02-01), Coleman

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