Plotting instrument

Details Plotting instrument Plotting instrument

1977-06-28

1980-02-05

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65, D1004

Patent

active

D02541254

REFERENCES:
patent: 3448920 (1969-06-01), Hall
patent: 3535790 (1970-10-01), Gray
patent: 3540127 (1970-11-01), Kane
patent: 3646681 (1972-03-01), Koenig
patent: 3724079 (1973-04-01), Jasperson

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