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US Patent: RE12,379
Ratchet Screw Key
Camille Contal - Paris, France

USPTO Classifications:
81/177.6, 81/58.3, 81/DIG.11

Tool Categories:
wrenches : wrench components : wrench handle components
wrenches : ratchet wrenches


Frank Mossberg Co. - Attleboro, MA
Sargent Co. - Quincy, MA
Motor Parts Co. - Plainfield, NJ

Archibald R. Baker
John Baker
C. A. Mullen
H. S. Gautier

Patent Dates:
Applied: Apr. 15, 1905
Granted: Aug. 15, 1905

Reissue Information:
Reissue of 751,055 (Feb. 02, 1904)

Patent Pictures: [ 1 | 2 ]
Camille Contal Pat. August 15, 1905
USPTO pdf tiff
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The patent mentions the sockets, universal joint, and rod handle shown in the drawings. The key item in the patent is the unique spring-loaded "slip-clutch" ratchet section.

Mossberg took over U.S. production in 1909, and made the Auto-Cle the center of an extensive line of socket sets.

Contals' Nov. 7, 1916 "Extensible Tool" patent (no. 1,203,853) is based on the AUTO-CLE.

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