German Patent and Trade Mark Office
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What links here
Rudolf Hell
Image dissector
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FILECOMP
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Alexander Bain (inventor)
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Radiofax
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Phototypesetting
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1929 in science
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Video camera tube
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Hellschreiber
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List of inventors
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Dot matrix printing
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Telegraphy
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RCA Corporation
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Fax
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December 19
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