Portable water quality tester

Details Portable water quality tester Portable water quality tester

1984-08-20

1987-07-14

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

D10 78, D10103

Patent

active

D02908204

REFERENCES:
patent: D181743 (1957-12-01), Molloy
patent: D222138 (1971-10-01), Palmer
patent: D246956 (1978-01-01), Perry
patent: D249480 (1978-09-01), Jungman
patent: D251548 (1979-04-01), Perry
patent: D260618 (1981-09-01), Koslar
patent: D261871 (1981-11-01), Akers
patent: D276796 (1984-12-01), Allender
patent: D282915 (1986-03-01), Hartshorn
patent: 3829776 (1974-08-01), Lozoya
patent: 4259635 (1981-03-01), Triplett

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