Four great inventions

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Across
  1. 5. a thin sheet of card, plastic, or metal with a pattern or letters cut out of it, used to produce the cut design on the surface below by the application of ink or paint through the holes
  2. 7. a violent shattering or blowing apart of something
  3. 9. cut (a hard material) in order to produce an object, design, or inscription
Down
  1. 1. the act of directing a ship, aircraft, etc. from one place to another, or the science of finding a way from one place to another
  2. 2. connected with the sea, especially in relation to seaborne trade or naval matters
  3. 3. able to withstand wear, pressure, or damage; hard-wearing
  4. 4. a roll of parchment or paper for writing on
  5. 6. a very fine slender piece of polished metal with a point at one end and a hole or eye for thread at the other, used in sewing
  6. 8. the surrounding of a place by an armed force in order to defeat those defending it