Engineering crossword

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Across
  1. 2. this engineer has made welding
  2. 4. they tracked the energy usage
  3. 6. they made the truly hands-free phones
  4. 7. fixxed inventions
  5. 8. they made the telephone
  6. 9. this engineer makes earthquake detectors
Down
  1. 1. this engineer made the robotic arm
  2. 3. they made a steam engine
  3. 5. this engineer made the sonar
  4. 10. they made the heat pump