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Are you Günter Springer, author of the books below?
Lexikon Elektrotechnik, Elektronik  by Günter Springer Elektrotechnik, Energieelektronik. Fachbildung. by Günter Springer Elektrotechnik, Arbeitsblätter, Grundstufe by Jürgen Manderla Elektrotechnik, Arbeitsblätter, Fachstufe by Jürgen Manderla


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