Sampling depth bob

Details Sampling depth bob Sampling depth bob

1979-10-25

1981-09-29

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

D10 70, D10 61, D1004

Patent

active

D02609746

REFERENCES:
patent: D160541 (1950-10-01), Rippon
patent: D190299 (1961-05-01), Krueger
patent: D235626 (1975-07-01), Covey
patent: 1947592 (1934-02-01), Haller
patent: 2163402 (1939-06-01), Mason
patent: 2634612 (1953-04-01), Quist

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