US Patent: 347,844 - Micrometer Inside Calipers


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US Patent: 347,844

Micrometer Inside Calipers

Patentee:

John T. Usher (exact or similar names) - Elmira, NY

USPTO Classifications:

33/817

Tool Categories:

metalworking tools : machinist tools : measuring tools : micrometers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Leonard Dodd

Martin O'Connor

Patent Dates:
Applied:	Feb. 19, 1886
Granted:	Aug. 24, 1886

Patent Pictures:

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Description:

This invention pertains to micrometer-calipers for accurate ad measurement of sizes, and it relates to an instrument devised especially for use in making inside measurements as, for instance, in measuring the diameter of holes.