Straightedge

Details Straightedge Straightedge

1975-10-14

1977-11-22

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02464411

REFERENCES:
patent: 205795 (1978-07-01), Green
patent: 2214999 (1940-09-01), Hullinger
patent: 2486748 (1949-11-01), Koenig

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