Acknowledgements
Coll. Olivier Mendez, Association Francaise du Titanic
© Encyclopedia Titanica (www.encyclopedia-titanica.org) 1996-2012 and third parties (ref: #2512, accessed 15th February 2012 09:24:05 AM)
URL : http://www.encyclopedia-titanica.org/submarine-signalling-system-white-star-liner.html