Percy Spencer's Life

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Across
  1. 3. rudimentary box that heats things.
  2. 5. someone who makes inventions.
  3. 6. armed services that conduct military operations at sea.
Down
  1. 1. someone who works with science.
  2. 2. an electron tube for amplifying or generating microwaves.
  3. 4. the emission of energy as electromagnetic waves or moving subatomic particles.