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1
by Robinson, David G., Ehlers, Ulrich, Herken, Rainer, Herrmann, Bernd
Published 1987
Springer Berlin Heidelberg
“...In 1939, when the electron optics laboratory of Siemens & Halske Inc. began to manufacture...”
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2
Published 1991
Springer Berlin Heidelberg
“... microscope. One of the two first instruments built by Siemens was used by Helmut Ruska, a brother of Ernst...”