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US Patent: 463,820
Alexander Lesperance - Laconia, NH
Thomas H. Worrall - Laconia, NH

USPTO Classifications:
192/111.1, 192/70.26

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

Thomas H. Worrall - Laconia, NH

American Twist Drill Co. - Laconia, NH

Edgar R. Reeves
John W. Ashman

Patent Dates:
Applied: Jul. 09, 1891
Granted: Nov. 24, 1891

Patent Pictures:
USPTO pdf tiff
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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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