Ruler

Details Ruler Ruler

1989-04-17

1991-07-23

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03184358

REFERENCES:
patent: 83115 (1868-10-01), Wilson
patent: D202290 (1965-09-01), Seely, Jr.
patent: D202650 (1965-10-01), Tucker
patent: 289512 (1883-12-01), Darling
patent: 317188 (1885-05-01), Pederson
patent: 2877828 (1937-04-01), Dombrowski
patent: 4247986 (1981-02-01), Burroughs
patent: 4484395 (1984-11-01), Samuels

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