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Clamp for Spirit-Levels.
Patent for clamps for spirit levels that allow a spirit level to be attached directly to a straight edge so that one person could safely use both the straight edge and the spirit level simultaneously. Additionally, the clamp production is simple so it can be produced at a low cost.
Date:
April 30, 1918
Creator:
Bridgman, Jesse Everet
System:
The Portal to Texas History