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US Patent: 2,428,234
Internal Micrometer
Patentee: Alfred George Mapp (exact or similar names) - Cheltenham, England USPTO Classifications: 310/25, 33/783, 33/DIG.5, 336/105, 336/133, 336/136, 336/30, 336/67, 336/87, 336/92, 73/728 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Rotol Ltd. - unknown, England Witnesses: none listed	Patent Dates: Applied: Mar. 23, 1943 Granted: Sep. 30, 1947 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: Wilkinson & Mawhinney - patent attorneys Application in Great Britain, 16 Jan 1942.

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