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US Patent: 320,537
Spirit Level
Patentee:
Bozwell B. Butt - Newark, NJ

USPTO Classifications:
33/381

Tool Categories:
layout tools : levels : metallic levels

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Robert Martin
C. L. Smith

Patent Dates:
Applied: Aug. 14, 1884
Granted: Jun. 23, 1885

Patent Pictures:
USPTO pdf tiff
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