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On a table along with some old tubes and other technology unknown to Fessenden in 1906 was this Crosley model 51 receiver. The label, which I found interesting, states that it was licensed under Armstrong's regeneration patent of 1914, but it doesn't mention Fessenden's earlier AM patent, so it must date to the early 1920s.
Copyright 2006, Garrett Wollman. All rights reserved. Photograph taken 2006-08-05.