Airplane level

Details Airplane level Airplane level

1988-02-19

1991-12-24

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03225810

REFERENCES:
patent: D53902 (1919-10-01), Grant
patent: D54447 (1920-02-01), Nelson
patent: D55434 (1920-06-01), Peoples
patent: D135194 (1943-03-01), Aronoff
patent: 2012424 (1935-08-01), Fincke

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