Line level

Details Line level Line level

1984-04-09

1987-03-10

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D02886715

REFERENCES:
patent: D229225 (1973-11-01), Covey
patent: D255434 (1980-06-01), Hanson
patent: D256337 (1980-08-01), Derryberry
patent: 4521974 (1985-06-01), Neis

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