Image and info submitted by hemingray:

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Found in Cave City, AR, in a well-frequented antique store, an old 2-Way Edison plug adaptor. Made of porcelain with a brass upper shell, the two porcelain rings on top of the brass shell are removable. (adaptor is positioned almost upside-down). Adaptor has a patent date of 3-3-03 (1903), and a 2nd date of 5-17-04 (1904). Has the standard rating of 660W/250V, and on one side, "Western Electric" is stamped into the brass between the two sockets:

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Thanks Cliff. [Linked Image]