Inclination measuring instrument

Details Inclination measuring instrument Inclination measuring instrument

1991-01-24

1993-05-18

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 71

Patent

active

D03356345

REFERENCES:
patent: D306980 (1990-04-01), Pivovaroff
patent: 978525 (1910-12-01), Werts
patent: 4394801 (1983-07-01), Thibadeaux
patent: 4442606 (1984-04-01), Graham et al.
patent: 4513512 (1985-04-01), Fisher
patent: 4660293 (1987-04-01), Kovacs
patent: 4745689 (1988-05-01), Hiltz
Hong Kong Enterprise, Time Ruler Calculators, Nov. 1987, p. 328, found in D10/62 Design Art Library.

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