Roof pitch determination tool

Details Roof pitch determination tool Roof pitch determination tool

1993-09-20

1994-07-19

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03488489

REFERENCES:
patent: 2421754 (1947-05-01), Little et al.
patent: 2749623 (1956-06-01), Barre, Jr. et al.
patent: 4490916 (1985-01-01), Blum
patent: 4604812 (1986-08-01), Arjomand
patent: 4989334 (1991-02-01), DuBose, Jr.

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