Illuminated level

Details Illuminated level Illuminated level

1986-09-12

1989-06-13

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03015530

REFERENCES:
patent: D224663 (1972-08-01), de Jong
patent: D269255 (1983-06-01), Olson
patent: D280185 (1985-08-01), Wright
patent: 2790069 (1957-04-01), Alexander
patent: 4407075 (1983-10-01), MacDermott
patent: 4419833 (1983-12-01), Wright
Popular Mechanics-11/1952, p. 225, Item #7, level.

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