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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 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen
Description: An example appeared on ebay marked with the patent date, patent number and I. SP. L. Co.

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