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US Patent: 1,416,573
Micrometer Attachment Micrometer Attachment for Calipers
Patentee: James A. Obole (exact or similar names) - Torrance, CA USPTO Classifications: 33/558.3 Tool Categories: layout tools : measurement gauges layout tools : calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 02, 1920 Granted: May 16, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a small micrometer that is designed to be attached to one leg of a machinist's calipers.

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