INVENTIONS

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Across
  1. 2. a toothed wheel
  2. 3. the action of inventing
  3. 5. to become better
  4. 7. a machine that supplies motive power for a vehicle
Down
  1. 1. an act of squeezing
  2. 3. a person who has invented something
  3. 4. to produce for a first time
  4. 6. a machine having two/more cylinders turn by handle