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US Patent: 396,689
Improved Wrench and Oiler
Alexander L. Duncan - Roscoe, NY

USPTO Classifications:
81/124.4, 81/185, 81/2

Tool Categories:
wrenches : wrench combination tools
wrenches : socket wrenches

Thomas L. Lindsay - Roscoe, NY
Alexander L. Duncan - Roscoe, NY

Not known to have been produced

F. L. Ourand
Benj. G. Cowl
Thomas L. Lindsay
Demetrius D. De Silvy

Patent Dates:
Applied: Apr. 16, 1888
Granted: Jan. 22, 1889

Patent Pictures:
Alexander L. Duncan patent January 22, 1889
USPTO pdf tiff
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The wrench has two sockets. Each has an interior chuck for a smaller size. Each spring latch releases one chuck to retract to open the larger size. The wrench could be supplied with sets of several sizes of such chucks. The handle is hollow, with a spring-loaded needle valve, forming an oiler.

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