Drawing instrument

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

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D10 71

Patent

active

D03303373

REFERENCES:
patent: 5138 (1871-07-01), Harmon
patent: 24042 (1895-02-01), Palmer
patent: 25489 (1896-05-01), Tappan-Eggleston
patent: D131626 (1942-03-01), Ellwood et al.
patent: D207794 (1967-05-01), Charrington
patent: 4211010 (1980-07-01), Backe et al.

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