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US Patent: 511,377
Spirit-Level
Patentee:
Justus A. Traut - New Britain, CT

USPTO Classifications:
33/350, 33/379

Tool Categories:
layout tools : levels : metallic levels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Francis H. Richards
Emma G. Fowler
Wm. B. Yorkman
John L. Edwards, Jr.

Patent Dates:
Applied: Jun. 10, 1893
Granted: Dec. 26, 1893

Patent Pictures:
USPTO pdf tiff
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Description:
This design features a sliding cover for the vial tube, and the ability to separate the tube from the base.

Stanley produced similar levels to this design (see Traut's 1896 patents 565,097 and 565,098), but none exactly like this one.

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