Color comparator

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

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D03258815

REFERENCES:
patent: D316826 (1991-05-01), Neuman
patent: 1389836 (1921-09-01), Mooney
patent: 1495763 (1924-05-01), Simpson et al.
patent: 1675967 (1928-07-01), Zitkowski
patent: 3773425 (1973-11-01), Bentley
patent: 4073623 (1978-02-01), Bodart

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