What is a poor man's patent?

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Tags

  1. #cancelled
  2. #patent
  3. #office
  4. #yourself
  5. #familiar
  6. #those
  7. #postage
  8. #proof
  9. #invention
  10. #authenticate
  11. #description
  12. #sealed
  13. #involves
  14. #order
  15. #envelope
  16. #mailing