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