Critical Vocabulary The Inventor's Secret

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Across
  1. 5. legal documents that make it so no one else can sell your invention
  2. 6. having circular ends and straight sides
  3. 8. worked in a rough uneven way that makes a popping noise
  4. 9. specialized machines or electronic devices
Down
  1. 1. engines that make a train go forward
  2. 2. machine that plays recorded sound
  3. 3. a complete failure
  4. 4. something that gives off bright light
  5. 7. move slowly and noisily