Interchangeable horizontally and vertically laser suitable...

Geometrical instruments – Straight-line light ray type – Vertical and horizontal angle measurer

Reexamination Certificate

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C033S286000, C033SDIG021

Reexamination Certificate

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07493699

ABSTRACT:
A laser transmitter adapted for use in small spaces such as pipes and sewers includes a housing having two exit windows positioned in generally orthogonal planes. The laser transmitter includes a leveling mechanism that is capable of directing a collimated beam through a select one of the two exit windows, in a generally horizontal direction at a specified grade irrespective of whether the laser transmitter is oriented generally horizontally or generally vertically.

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Laying Pipe with PL 120 an Introduction, 2001, 45 pages, LCI Lasers, Hawthorne, California USA.

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