British standard specification for the electrical performance of industrial electric motors and generators with class A insulation : superseding B.E.S.A. publication no.72-1917 in so far as it applies
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British standard specification for the electrical performance of industrial electric motors and generators with class A insulation : superseding B.E.S.A. publication no.72-1917 in so far as it applies
（British Engineering Standards Association, No. 168-1923）
Crosby Lockwood, 1923
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