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US Patent: 1,424,383
Micrometer Gauge Adjustable Micrometer
Patentee: John A. Schleicher (exact or similar names) - Saginaw, MI USPTO Classifications: 33/816 Tool Categories: layout tools : measurement gauges Assignees: Lufkin Rule Co. - Saginaw, MI Manufacturer: Lufkin Rule Co. - Saginaw, MI Witnesses: Unknown	Patent Dates: Applied: Nov. 21, 1921 Granted: Aug. 01, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This micrometer features a rotating sleeve to allow the zero point to be easily adjusted. This feature was used on most Lufkin micrometers, and was later adopted by many other manufacturers.

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