Monitoring well cap

Details Monitoring well cap Monitoring well cap

1989-06-02

1991-06-04

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

D10 46, D23261

Patent

active

D03172716

REFERENCES:
patent: 1345214 (1920-06-01), Moore
patent: 1689979 (1928-10-01), Tate et al.
patent: 1791277 (1931-02-01), Lake
patent: 2169312 (1939-08-01), Wilking
patent: 2179191 (1939-11-01), McWilliams
patent: 3394836 (1968-07-01), Millard
patent: 3860142 (1975-01-01), Jurges
patent: 4370919 (1983-02-01), Wagner et al.
patent: 4457448 (1984-07-01), Beagell

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