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All answers having "American inventor" as clue:

4 Character Answers:

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BELL

EADS

ESLA

HOWE

MOOG

OTIS

RENO



5 Character Answers:

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MORSE

TESLA



7 Character Answers:

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EASTMAN



9 Character Answers:

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ELIASHOWE



10 Character Answers:

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ELIWHITNEY