Protractor

Details Protractor Protractor

1991-06-18

1993-05-25

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 62

Patent

active

D03358232

REFERENCES:
patent: D328256 (1992-07-01), Harvey
patent: 346519 (1886-08-01), Tybjerg
patent: 665316 (1901-01-01), Fay
patent: 1331415 (1920-02-01), Civitts

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