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W M Welch Scientific Company 1922 Dynamo-Electric Machinery Vintage Ad

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Original vintage optical industry trade magazine ad for W.M. WELCH SCIENTIFIC COMPANY of Chicago, IL. Manufacturers, Importers and Exporters of Scientific Apparatus and School Supplies. Complete Dynamo Electric Machinery Apparatus for Demonstrating Direct Current Motors and Generators, Alternating Current Rotating Field and Induction Motor, The Rotary Converter. Old 1922 optical laboratory industry instrument advertisement.
    • SKU s256
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