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julieashtoby | 14:58 Sun 25th Jan 2009 | Crosswords
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28a Streams of electrons directed in a vacuum tube (7,4)

?a?h?d? rays


last one, many thanks
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Cathode rays
How about Cathode Rays as in a TV (Vacuum Tube).
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thanks to greyfox and legin7, great help, finally finished!

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