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US Patent: 834,857
Thomas H. Worrall - Laconia, NH

USPTO Classifications:
192/70.3, 192/99R

Tool Categories:
metalworking machines : metalworking machine mechanisms : metalworking power transmission
industrial machines : industrial machine mechanisms : industrial machine clutches


American Twist Drill Co. - Laconia, NH

O. J. George
George P. Munsey

Patent Dates:
Applied: Nov. 09, 1905
Granted: Oct. 30, 1906

Patent Pictures:
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"Vintage Machinery" entry for A. B. Nutting & Co.
A double-ended grinder arbor with separate clutches for each wheel is reported. It has "A. B. Nutting & Co. / Amesbury Mass. / Patent Applied For" cast into the bearing covers; a separate brass plaque says, "Am. Twist Drill Co. / Laconia, N.H. / Patented Nov 24, 91 / May 5, 96 / July 13, 97 / June 28, 98 / Oct. 30, 06"

Assignee Worrall was co-founder of the American Twist Drill Co.

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