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demonstration National type A "Velvet Vernier" dial

demonstration National type A "Velvet Vernier" dial

National Company, Inc.
1924-1930
demonstration radio broadcast receiver

demonstration radio broadcast receiver

H. T. G. Co.
1934-1950
electrical circuit and radio demonstration model

electrical circuit and radio demonstration model

Department of Physics, Harvard University
circa 1940
electrical circuit and radio demonstration model, part

electrical circuit and radio demonstration model, part

Department of Physics, Harvard University
circa 1940
electrical circuit and radio demonstration model, part

electrical circuit and radio demonstration model, part

Department of Physics, Harvard University
circa 1940
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