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US Patent: 729,004
Laroy S. Starrett - Athol, MA

USPTO Classifications:
135/79, 279/102, 81/438

Tool Categories:
screwdrivers : screwdriver mechanisms

L. S. Starrett Co. - Athol, MA

L.S. Starrett Co. - Athol, MA

Frank E. Wing
Willard G. Nims

Patent Dates:
Applied: Oct. 23, 1901
Granted: May 26, 1903

Patent Pictures: [ 1 | 2 | 3 ]
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Sold by the L.S.Starrett Co. as the #550 screwdriver with replaceable/ interchangeable tips.Held in place by friction. With the addition of a screw holder, Patent #730804 June 9, 1903 also by Laroy S. Starrett, it becomes the #551.Both the #550 and #551 are sold in the #17 Starrett catalog 1905 , but by 1925 only the #551 is offered. Sample has both Patent dates on the screw holder and the screw holder is marked #551. The screw driver has only the 5/26/1903 patent on it and the #550.

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