Trigonometric function overlay

Details Trigonometric function overlay Trigonometric function overlay

1992-06-11

1993-12-28

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65

Patent

active

D03426858

REFERENCES:
patent: D209775 (1968-01-01), Baker
patent: 2557965 (1951-06-01), Hilsenrath et al.
patent: 5013149 (1991-05-01), Downum et al.
William T. Stokes; Gems of Geometry; Trigonometric Function Generator; .RTM.1978; pp. 85-86.

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