Geometrical instruments – Straight-line light ray type – Process
Patent
1982-02-25
1984-10-16
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Process
33138, 33174N, 33342, 33347, 33DIG1, G01B 310
Patent
active
044766351
ABSTRACT:
A gravitational protractor and measuring tape for determining the distance between respective conduit ends residing at differential elevations.
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patent: 3021599 (1962-02-01), Odom
patent: 3036791 (1962-05-01), Siggelkow
patent: 3499225 (1970-03-01), Darrah
patent: 3568319 (1971-03-01), Moll
Martin, Jr. William D.
Reiter Bernard A.
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