File:Prototype Armstrong superheterodyne receiver 1920.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:27, 10 December 2019		1,462 × 596 (130 KB)	Sthapa (talk \| contribs)	Public Domain https://upload.wikimedia.org/wikipedia/commons/c/ce/Prototype_Armstrong_superheterodyne_receiver_1920.jpg

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