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  • Patent No.1012273
  • Patent No.1312584
  • Patent No.1562652
  • Patent No.1617833
  • Patent No.1707410
  • Patent No.1750449
  • NET No.12 (Ministry of Const.& Transp.)
  • NET No.145 (Ministry of Const.& Transp.)
  • NET No.215 (Ministry of Const.& Transp.)
  • EVT No.35 (Ministry of Environment)
  • NET No.33 (Ministry of Environment)