black history month

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