Sine bar

Details Sine bar Sine bar

1992-03-04

1993-11-16

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03413241

REFERENCES:
patent: D137417 (1944-03-01), Baker
patent: D276317 (1984-11-01), Schley
patent: D303356 (1989-09-01), Couch
patent: 2325904 (1943-08-01), Brebeck
patent: 2417150 (1947-03-01), Berry
patent: 3200503 (1965-08-01), Gutknecht
patent: 3276133 (1966-10-01), Nowjak
patent: 3345754 (1967-10-01), Lipkins

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