Center of gravity level

Details Center of gravity level Center of gravity level

1985-07-25

1988-05-03

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65

Patent

active

D02955032

REFERENCES:
patent: 53795 (1866-04-01), Doran
patent: D200663 (1965-03-01), Guffy
patent: 360378 (1887-03-01), Duffy
patent: 937633 (1909-10-01), Neidl
patent: 1110026 (1914-09-01), Zars
patent: 1133887 (1915-03-01), Satterfield
patent: 1370233 (1921-03-01), Spier
patent: 1495629 (1924-05-01), Arthur

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