Torch protractor

Details Torch protractor Torch protractor

1991-03-05

1993-11-30

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D15140

Patent

active

D03417840

REFERENCES:
patent: D311544 (1990-10-01), Hayes et al.
patent: 3900346 (1975-08-01), Muller et al.
patent: 4021025 (1977-05-01), Franc
patent: 4053145 (1977-10-01), Steele
patent: 4411411 (1983-10-01), Barthelness

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