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US Patent: D10,016
Design for Spirit Levels
Patentee:
Leonard L. Davis - Springfield, MA

USPTO Classifications:
D10/69

Tool Categories:
layout tools : levels : metallic levels

Assignees:
None

Manufacturer:
Davis Level & Tool Co. - Springfield, MA

Witnesses:
Willmore B. Stone
J. P. Buckland

Patent Dates:
Applied: May 14, 1877
Granted: May 29, 1877

Patent Pictures:
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Description:
Classic Davis metal level. Four ornamental cross-bars or rungs are the key patented design. Three other patents D10014, D10015, and D10017, were also submitted on the same date by Davis. Interesting to note that instead of a drawing provided for the patent application, a photograph was submitted instead. Additionally, there are only 14 days between the application and the grant date. Length of the patent is for 7 years.

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