Pool water tester

Details Pool water tester Pool water tester

1977-11-17

1980-08-26

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

D24 17, D1004

Patent

active

D02565676

REFERENCES:
patent: D185543 (1959-06-01), Frank
patent: D186271 (1959-10-01), Marks
patent: D197404 (1964-01-01), Frank
patent: D216258 (1969-12-01), Connolly
patent: D232038 (1974-07-01), Hach
patent: D247821 (1978-05-01), Biersch
patent: 3176577 (1965-04-01), Frank
patent: 3381572 (1968-05-01), Tuwiner

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