Thordarson Electric Manufacturing Company of Chicago was the largest exclusive transformer manufacturer in the world. This reprint compiles: #346A Sound Amplifier Manual 1934, #342A Serviceman's Guide 1935, #342B Radio Servicing Guide 1936, #344B Transmitter Guide 1935 and Transformer Catalogs #400 and #500. ©Thordarson. Lindsay Publ.

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