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US Patent: 1,831,813
Attachment for drills Centering guide
Patentee: Axel Levedahl (exact or similar names) - Aurora, IL USPTO Classifications: 408/112, 408/81, 606/96 Tool Categories: handheld power tools : handheld power tool accessories Assignees: Independent Pneumatic Tool Co. - Chicago, IL Manufacturer: Independent Pneumatic Tool Co. - Chicago, IL Witnesses: Unknown	Patent Dates: Applied: Jul. 02, 1928 Granted: Nov. 17, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Thor Power Tool Co.
Description: Assignee Independent Pneumatic Tool Company changed its name in 1953 to Thor Power Tool Co.

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