Innovations of the 1920s

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Across
  1. 2. inventions
  2. 4. plays in the car
  3. 5. year of best innovations
  4. 6. was used in war and is banned now
  5. 7. used to get people's attention
  6. 9. founded by Paul galvin
  7. 10. police use this to catch liars
Down
  1. 1. Galvin is CEO
  2. 3. the day frank mcerlane killed other gang
  3. 8. nickname for tommy gun