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US Patent: 7,689
Spring Calipers
Patentee:
William W. Smith (exact or similar names) - Boston, MA

USPTO Classifications:
33/558.1

Tool Categories:

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Joshua Stevens
E. V. B. Holcomb
Patent Dates:
Granted: Oct. 01, 1850

Patent Pictures: [ 1 | 2 ]
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Description:
Circular spring enclosed within the caliper head.

An example marked with this patent date appeared in one of Martin Donnelly's auctions.

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