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#01 Brevetto US8387925 - Giunto air coupled HDTS A track circuit for railway systems or the like includes a track segment of predetermined length electrically insulated from an adjacent track segment by an electric joint US20110147535.pdf
Google Patent link
#02 Brevetto EP2390158B1 - System for communication with trains on railway lines r The invention relates to a system for communi- cating with trains on railway lines, which system compris- es the combination of features EP2390158B1.pdf
Google Patent link

Revision 10/09/2013