Perspective T-square

Details Perspective T-square Perspective T-square

1980-01-09

1981-12-08

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02621959

REFERENCES:
patent: 467764 (1892-01-01), Godeffroy
patent: 703140 (1902-06-01), Lees
patent: 817214 (1906-04-01), Zimmerman
patent: 1173341 (1916-02-01), Cottom
patent: 2238581 (1941-04-01), De Lisle

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