The coupling device of the present invention includes a housing, a first fastening member attached to said housing and coupled to the power line, a second fastening member attached to the housing and coupled to the power line, an inductor providing an impedance to data transmissions between the first...http://www.google.co.uk/patents/US20030234713?utm_source=gb-gplus-sharePatent US20030234713 - Power line coupling device and method of using the same
