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US Patent: 2,164,455
Shaft indexing device
Patentee: Franklin L. Hart (exact or similar names) - Boston, MA USPTO Classifications: 269/172, 269/239, 269/243, 409/222, 74/813R Tool Categories: work holding Assignees: None Manufacturer: Walter W. Field & Son, Inc. - Cambridge, MA Witnesses: Unknown	Patent Dates: Applied: Jan. 12, 1939 Granted: Jul. 04, 1939 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: An example is marked with the patent number and "Walter W. Field & Son, Inc. / Cambridge, Mass."

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