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All answers having "Transmit" as clue:

3 Character Answers:

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FAX



4 Character Answers:

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EMIT

SEND



5 Character Answers:

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RADIO

RELAY



6 Character Answers:

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HANDON

IMPART

RENDER



7 Character Answers:

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CONDUCT



8 Character Answers:

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TELECAST



9 Character Answers:

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TELEMETER