DK81815C -
Apparatus with an electron tube in which electrically charged particles are held together in a beam over a considerable distance.
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Apparatus with an electron tube in which electrically charged particles are held together in a beam over a considerable distance.
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DK393951A1951-01-041951-12-29
Apparatus with an electron tube in which electrically charged particles are held together in a beam over a considerable distance.
DK81815C
(en)