Illuminated spirit level

Details Illuminated spirit level Illuminated spirit level

1981-10-08

1983-10-25

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02710889

REFERENCES:
patent: D180624 (1957-07-01), Souter
patent: D212906 (1968-12-01), Bubrick
patent: D245071 (1977-07-01), Kong

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