Online Sale - something I'd heard of but had yet to see until now. I located newspaper ads for it from 1930 to 1939. The attached is from the March 31, 1930, edition of the PITTSBURGH POST-GAZETTE. Looking up both design patents using Google's search engine, I discovered that the inventor was Max L. Goldbert, who assigned it to the Electric Trading Corporation of New York. The earlier of the two patents, the design of which was less similar to the range featured in the photos below, was granted to John Fletcher for the ETC.











