Abstract: A telephone disconnect system having a current-sensitive relay which automatically operates to electrically connect the telephone lines to the telephone network when the cradle switch of the telephone is closed, and which automatically operates to electrically disconnect the telephone lines from the telephone network when the cradle switch is open thus providing protection against the use of a cradled telephone as a clandestine listening device.

Abstract: An improved reusable writing tablet, having raised document guides that define a document support surface, and a method for affixing and removing a cover sheet over the document support surface, where said document guides define a means to allow the insertion of tabs defined by a cover sheet, so that a cover sheet is held securely in place, and is easily removable from the base to allow the placement of documents between said cover sheet and the document support surface, and where said documents are viewed through the cover sheet, and are prevented from sideways movement by the cover sheet and raised document guides.

Abstract: The circuit uses a current sensing device that is controlled by the telephone line current. The telephone lines are connected to the contacts of a push-button switch, and a diode bridge is connected across contacts of the switch. Further, the circuit has a DC slow-release relay that is located across the output of the diode bridge. The telephone lines are also connected to the relay contacts of the DC slow release relay. A capacitor is placed across the telephone lines, and another capacitor is placed between the diode bridge and one of the relay contacts of the DC slow-release relay. The two capacitors act to shunt any radio frequencies that occur in the circuit as a result of an attempt to obtain information by RF saturation techniques.