1929 in science
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What links here
Hellschreiber
Ticker tape
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Automatic Packet Reporting System
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Human-readable medium and data
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Soldatensender Calais
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Hell (disambiguation)
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PSK31
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List of inventors
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Shortwave radio
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Slow-scan television
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Dot matrix printing
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Rudolf Hell
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Telegraphy
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Radioteletype
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Fax
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December 19
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