PH Testing device

Details PH Testing device PH Testing device

1976-08-02

1978-09-19

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

D10 56X, D1004

Patent

active

D02494809

REFERENCES:
patent: D181743 (1957-12-01), Molloy
patent: D186908 (1959-12-01), Parmater
patent: D206004 (1966-10-01), Perkins
patent: D211058 (1968-05-01), Neubrech
patent: D215238 (1969-09-01), Seidel
patent: D223293 (1972-04-01), Banks
patent: D223359 (1972-04-01), Anderson
patent: D225005 (1972-10-01), Greene
patent: D225743 (1973-01-01), Seltzer
patent: D226271 (1973-02-01), Holtzman
patent: D237982 (1975-12-01), Hoogesteger
patent: 3806797 (1974-04-01), Harvey

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