Color comparator for testing swimming pools

Medical and laboratory equipment – Equipment for diagnosis – analysis – or treatment – Orthopedic or chiropractic

Patent

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Details

D10 46, D2402

Patent

active

D02478218

REFERENCES:
patent: D232037 (1974-07-01), Hach et al.
patent: D232038 (1974-07-01), Hach et al.
patent: 3176577 (1965-04-01), Frank
patent: 3381572 (1968-05-01), Tuwiner
patent: 3964831 (1976-06-01), Frank

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