Ruler

Details Ruler Ruler

1979-05-09

1980-11-25

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02575566

REFERENCES:
patent: 57970 (1866-09-01), Reid
patent: 243753 (1881-07-01), Barton
patent: 290945 (1883-12-01), Upham
patent: 443652 (1890-12-01), Jewell

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