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US Patent: 594,692
Spirit Level
Patentee:
Gustav Henneberg (exact or similar names) - New York, NY

USPTO Classifications:
33/1R, 33/350

Tool Categories:
layout tools : levels

Assignees:
Eduard Leissner - New York, NY

Manufacturer:
Unknown

Witnesses:
Peter Winderling
Henry Schreier
Patent Dates:
Applied: Aug. 20, 1887
Granted: Nov. 30, 1897

Patent Pictures: [ 1 | 2 | 3 ]
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Description:
An example appeared on ebay marked with the patent date, patent number and I. SP. L. Co.

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