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Complete Catalogue of Electrical Measuring and Test Instruments Manufactured by Hartmann & Braun
Hartmann und Braun, Bockenheim-Frankfurt a/M.
其他書名
Electrical Engineers at Bockenheim-Frankfort O/M.
出版1894
URLhttp://books.google.com.hk/books?id=NXM_AQAAIAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN