Illuminated level

Details Illuminated level Illuminated level

1981-03-13

1983-06-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02692554

REFERENCES:
patent: 2198945 (1940-04-01), Morris
patent: 2652481 (1953-09-01), Hall
patent: 2720709 (1955-10-01), Stankawitz
patent: 2810206 (1957-10-01), Ziemann
patent: 2937264 (1960-05-01), Snyder
patent: 3114507 (1963-12-01), Dommer

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