blueprint 101 puzzle 1

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Across
  1. 2. of ruler
  2. 5. or rectangular pipe
  3. 7. activated switch
  4. 9. valve/reduces pressure
  5. 10. protective device
  6. 11. thermal unit
  7. 12. airflow
  8. 13. resistant passage
Down
  1. 1. of symbols
  2. 3. hollow pipe
  3. 4. of power
  4. 6. drawing
  5. 7. figure
  6. 8. one line drawing