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CA Patent: CA-12,020
Improvements on Threshing Machines
Patentees:
Leonidas Gray - Middletown Springs, VT
Albert Y. Gray - Middletown Springs, VT

USPTO Classifications:

Tool Categories:
wrenches : cylinder tooth wrenches
wrenches : ratchet wrenches
agricultural machines : threshers or thrashers

Assignees:
None

Manufacturer:
A. W. Gray's Sons - Middletown Springs, VT

Witnesses:
A. A. Greene
H. C. Ready
Charles Denny

Patent Dates:
Applied: Oct. 23, 1880
Granted: Nov. 24, 1880

Patent Pictures: [ 1 | 2 | 3 ]
Leonidas and Albert Y. Gray patent Nov. 24, 1880 (wrench) - edited from Canadian Patents Database
CIPO Data
Report data errors or omissions
12,020 in Canadian Patents Database
Description:
The patent discusses the construction of the cylinder and concaves, and the components of a ratchet wrench designed to work with that construction.

The wrench design also received a separate U.S. patent (no. 227,765 granted May 18,1880). An example is pictured in the DATAMP entry for that patent.

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