Inventions

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Across
  1. 2. What did Thomas Alva Edison invent in 1877?
  2. 4. What do inventors get for their inventions in order to keep ownership of the rights?
  3. 6. One of the things Hedy Lamar's invention is used in today.
  4. 7. What did record players play?
Down
  1. 1. How did people sew before the sewing machine?
  2. 3. What was Hedy Lamarr most known for being?
  3. 5. What was the machine that Issac Singer invented in 1851 used for?