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A Process of Rotary Field Induction Motor Calculation with Kapp’s Clock-diagram
Source materials for Engineering History: The University of Tokyo Digital Archive
Report of Third Year Excursion [Kobe Electric Lighting Co.]
Source materials for Engineering History: The University of Tokyo Digital Archive
電気(作文)〕
Yuzuru Hiraga Digital Archive
〔書翰〕〔謙一母死去弔文〕 〔発〕山本開蔵 〔宛〕平賀謙一
Yuzuru Hiraga Digital Archive