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1.

図書
図書
1. Motor vehicles and tractors : a textbook for students and a handbook for engineers
by P.M. Heldt
出版情報: Nyack, N. Y. : P. M. Heldt, c1929
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2.

図書
図書
2. The gasoline motor. 6th ed.
by P.M. Heldt
出版情報: New York : Nyack, 1920
シリーズ名: The gasoline automobile : its design and construction ; v. 1
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3.

図書
図書
3. Transmission, running gear and control. 4th ed.
by P.M. Heldt
出版情報: New York : Nyack, 1920
シリーズ名: The gasoline automobile : its design and construction ; v. 2
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4.

図書
図書
4. Electrical equipment : with notes on its maintenance, care and repair. 2nd ed.
by P.M. Heldt
出版情報: New York : Nyack, 1920
シリーズ名: The gasoline automobile : its design and construction ; v. 3
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