http://www.federalbridge.ca/

http://www.figgbridge.com/

http://www.goldengate.org/

http://www.historicbridgefoundation.com/

http://www.mackinacbridge.org/

http://www.confederationbridge.com/en/index.php

http://www.movablebridges.org.uk

http://www.tilts.lv

ООО "TILTS" (Латвия)