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    CANADA

  1. UTIAS
  2. ULTRAVIA

  3. CZECH REPUBLIC

  4. URBAN

  5. GERMANY

  6. ULBI

  7. ISRAEL

  8. URBANAERO

  9. RUSSIA

  10. UAIK
  11. UFIMTSEV
  12. UNIKOMTRANSO
  13. UUAP

  14. UNITED STATES

  15. UCC
  16. UFM
  17. ULLMANN
  18. UMBAUGH
  19. UNITED
  20. UNITED AIRCRAFT
  21. UNITED EASTERN
  22. UNITED HELICOPTER
  23. UNITED STATES
  24. UNITED TECHNICAL INDUSTRIES
  25. UNIVAIR
  26. UNIVERSAL MOLDED PRODUCTS
  27. UNRUH
  28. USAC
  29. US LIGHT AIRCRAFT

  30. YUGOSLAVIA

  31. UTVA