Traffic sign

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Visual

Patent

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D20 41

Patent

active

D03608468

REFERENCES:
patent: D116338 (1939-08-01), Gist
patent: D171909 (1954-04-01), Nelson
patent: D346286 (1994-04-01), Caponigro etal.
patent: 3116027 (1963-12-01), Kleppin

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