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Test of the infrared carbon-filament heat lamp. (a) Photograph of the... | Download Scientific Diagram
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Construction and test of a rotary transformer for direct current . COHSTRUCTIOK AND TESTof aROTARY TRANSFORMERforDIRECT CURRENT 22759 The introduotion of Tantalum filament lamps in1906 gave a great impetus to the
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