Hydrometer

Details Hydrometer Hydrometer

1980-08-12

1982-09-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

D1004

Patent

active

D02663155

REFERENCES:
patent: D150328 (1948-07-01), Appel
patent: D190096 (1961-04-01), Wayne
patent: D199083 (1964-09-01), Naylor
patent: D217499 (1970-05-01), Pietramale
patent: D239924 (1976-05-01), Elshansky
patent: 1648412 (1927-11-01), Linebarger
patent: 3722292 (1973-03-01), Pietramale
patent: 4037481 (1977-07-01), Callahan
patent: 4055708 (1977-10-01), Yamamoto
patent: 4074025 (1978-02-01), Miyagawa

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