Teaching protractor

Details Teaching protractor Teaching protractor

1975-11-24

1977-10-11

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02460335

REFERENCES:
patent: D156504 (1949-12-01), Grant
patent: D165849 (1952-02-01), Jordan
patent: 1665898 (1928-04-01), Strickland
patent: 2453261 (1948-11-01), Peters
patent: 3393457 (1968-07-01), Freda
patent: 3453738 (1969-07-01), Lipski
patent: 3460261 (1969-08-01), Frey
patent: 3925899 (1975-12-01), Hesse

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