Inventions and inventors

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Across
  1. 3. Also called skimobile, snowcat, a motor vehicle with a revolving tread in the rear and steerable skis in the front, for traveling over snow.
  2. 4. What did Benjamin Franklin invent?
  3. 7. Who invented school?
  4. 9. Who invented the car?
  5. 10. Who invented zipper?
  6. 11. A box, room, or cabinet in which food, drink, etc, are kept cool.
  7. 12. An explosive mixture, as of potassium nitrate, sulfur, and charcoal, used in shells and cartridge, in fireworks, for blasting, etc.
Down
  1. 1. An optical instrument for making distant objects appear larger and therefore nearer.
  2. 2. Who invented the pencil?
  3. 5. Which country was the inventor of insulin from?
  4. 6. A benevolent figure of legend, associated with Saint Nicholas, supposed to bring gifts to children on Christmas Eve.
  5. 8. Which country invented paper?