Protractor

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric

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Details

D10 62, D1004

Patent

active

D02679329

REFERENCES:
patent: 621177 (1899-03-01), Sykes
patent: 665316 (1901-01-01), Fay
patent: 1264633 (1918-04-01), Gibson
patent: 1961500 (1934-06-01), Larson
patent: 2011282 (1935-08-01), Hochman

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