Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 288
10, 1898. 3^ No. 390,439, of Oct. 2, 1888. A patent for a three-phase machine(No. 409,450, of Aug. 20, 1889), otherwise identical with this one, was issuedto the same inventor on a later application, filed Oct. 20, 1888—after the issueof the Tesla patents. April, 1901.] Rotary Transformers. 275…
Science · Technology · Meteorology · Patents
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