Expansible proportional rule

Details Expansible proportional rule Expansible proportional rule

1983-04-13

1986-05-27

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 61, D10 72

Patent

active

D02839865

REFERENCES:
patent: D135418 (1943-04-01), Turner
patent: D239093 (1976-03-01), Balla
patent: D248456 (1978-07-01), DeLuca
patent: D277365 (1985-01-01), Sogorka
patent: 787974 (1905-04-01), Clark
patent: 1528992 (1925-03-01), Rose
patent: 1595422 (1926-08-01), Rose

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