Spirit level

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

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D1004

Patent

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D02564416

REFERENCES:
patent: D59943 (1921-12-01), Watson
patent: D186284 (1959-10-01), Hoeh
patent: D238153 (1975-12-01), Johnson
patent: D239821 (1976-05-01), Muller
patent: 1159522 (1915-11-01), Miller
patent: 2633640 (1953-04-01), Buesko

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