pH Meter, or the like

Details pH Meter, or the like pH Meter, or the like

1981-12-28

1984-08-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

Patent

active

D02752689

REFERENCES:
patent: D181743 (1957-12-01), Molloy
patent: D203984 (1966-03-01), Roth
patent: D206264 (1966-11-01), Waligorski
patent: D215564 (1969-10-01), MacPhee
patent: D229968 (1974-01-01), Williams
patent: D249480 (1978-09-01), Jungman
patent: D251114 (1979-02-01), Potts
patent: D255552 (1980-06-01), Schonstedt
patent: D261871 (1981-11-01), Akers
patent: 3806797 (1974-04-01), Harvey
patent: 4090925 (1978-05-01), Jungman
IBM Instruments, Inc. (Electrochemical), Cat., 11/82, pp. 14-15, pH Meters at top.
Popular Mechanics, 11/78, p. 36, pH Meter at bottom right.

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