Across
- 1. invented the potato chip
- 4. invented 3-D optical illusion device
- 7. invented refrigeration systems for trucks
- 9. invented the traffic signal and the gas mask
- 11. revolutionized the world of food preservation
- 12. was the first African to preform open heart surgery
Down
- 2. invented automatic lubricator
- 3. invented peanut butter
- 5. invented the permanent waving machine
- 6. invented affordable electric microphones
- 8. invented innovate internet apps
- 10. invented the dry cleaning process