| http://www.w3.org/ns/prov#value | - in which station ground is isolated from the circuit except during signaling from the central officeUS394471715 Aug 197316 Mar 1976Western Electric Company, Inc.Flame-retardant, water-resistant composition and coating transmission member therewithUS402849417 May 19767 Jun 1977Bell Telephone Laboratories, IncorporatedEscrow telephone coin collection circuit and methodUS41692168 May 197825 Sep 1979N
|
