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US Patent: 1,365,779
Indicating Calipers
Patentee:
Thomas E. Grove - Dayton, OH

USPTO Classifications:
33/501.5

Tool Categories:
layout tools : calipers
metalworking tools : machinist tools : measuring tools : indicating calipers

Assignees:
None

Manufacturer:
Grove Mfg. Co. - Dayton, OH

Witnesses:
F. L. Walker
John Dineen
Wm. A. Swaney
Gladys Strain

Patent Dates:
Applied: Mar. 25, 1918
Granted: Jan. 18, 1921

Patent Pictures: [ 1 | 2 ]
Thomas E. Grove patent Jan. 18, 1921
USPTO pdf tiff
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Description:
"Micro-indicating" calipers: "The instrument is designed to indicate slight variations of measurement upon a magnified scale."

A contemporary trade journal write-up describes the tool's use in conjunction with a micrometer to verify the internal dimensions of holes.

A known example is marked, "Grove Mfg. Co. Dayton O. Pat. Pend."

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