Manometer

Details Manometer Manometer

1985-03-26

1987-11-24

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

D10 85

Patent

active

D02928914

REFERENCES:
patent: D223776 (1972-06-01), Gruett
patent: 1111455 (1914-09-01), Hamilton
patent: 2437861 (1948-03-01), Rohr
patent: 2664645 (1954-01-01), Qualman
patent: 2707396 (1955-05-01), Dupure
patent: 3150524 (1964-09-01), Arens
patent: 3730168 (1973-05-01), McWhorter
patent: 3807389 (1974-04-01), Miller
patent: 3886796 (1975-06-01), Gruett

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