Spherical spirit level

Details Spherical spirit level Spherical spirit level

1975-08-07

1977-04-05

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02439310

REFERENCES:
patent: 812251 (1906-02-01), Alexander
patent: 949842 (1910-02-01), Pugh
patent: 970360 (1910-09-01), Whigham
patent: 1277748 (1918-09-01), Owen
patent: 1479024 (1924-01-01), Booraem
patent: 2645030 (1953-07-01), Mahone
patent: 2767483 (1956-10-01), Sauer

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