Comparator for chemical testing of water

Details Comparator for chemical testing of water Comparator for chemical testing of water

1986-11-20

1990-06-26

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

Patent

active

D03088332

REFERENCES:
patent: D186271 (1959-10-01), Marks
patent: D232037 (1974-07-01), Hach et al.
patent: D232038 (1974-07-01), Hach et al.
patent: D247821 (1978-05-01), Biersch et al.
patent: 1794134 (1931-02-01), Baker et al.
patent: 3381572 (1968-05-01), Tuwiner
patent: 3604812 (1971-09-01), Walsen
patent: 3773425 (1973-11-01), Bentley

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