Say, M. G.
Direct current machines / M. G. Say, E. O. Taylor
Pitman Books, 1985
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Say, M.G.
Introduction to the unified theory of electromagnetic machines
The Pitman Press, 1978
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Simpson, A.
Light current electrical applications III
Macmillan, 1981
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Precision Machines
Springer Singapore, 2019
eBooks
Loper, Orla E.
Direct current fundamentals
Delmar Publishers, 1991
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