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US Patent: 1,080,560
Universal Tool Holder
Peter Erik Johanson - Warren, PA

USPTO Classifications:
279/24, 81/177.1, 81/177.85

Tool Categories:
screwdrivers : screwdriver blades


Hultberg Johanson Tool Co. - Warren, PA
Hultberg J. D. Hansen Tool Co - Warren, PA

Mikkel Holst
Peter Stangee

Patent Dates:
Applied: Mar. 11, 1912
Granted: Dec. 09, 1913

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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Tool shanks are held by a friction fit and flat end mating with corresponding socket in theh handle. The keyhole opening on handle allows a "releasing rod" to be inserted to remove the tool shank if it becomes stuck.

Known items marked: HULTBERG J.D. HANSEN TOOL CO./WARREN, PA/PAT. DEC 9, 1913

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