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All answers having "Power tool?" as clue:

3 Character Answers:

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DAM



5 Character Answers:

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DRILL



6 Character Answers:

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PLANER

SANDER



7 Character Answers:

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BANDSAW



8 Character Answers:

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CHAINSAW



10 Character Answers:

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TRIPHAMMER



11 Character Answers:

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CIRCULARSAW

HAMMERDRILL

MORTARBOARD