US Patent: 45,894 - Improvement in Calipers


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US Patent: 45,894

Improvement in Calipers

Patentee:

F. O. Washburn (exact or similar names) - Millville, MA

USPTO Classifications:

33/801

Tool Categories:

layout tools : calipers

Assignees:

John C. Scott - Millville, MA

F. O. Washburn - Millville, MA

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Granted:	Jan. 10, 1865

Patent Pictures:

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Description:

This is a caliper with a build in scale, and the ability to set both an inside and outside dimension at once. The inventor claims this to be useful for turning shafts to fit a hole.