Abstract: A safety circuit for protective operation at the interface between certain customer premises telephone installations and the external telephone distribution lines. The protection circuit includes a means for discriminating any voltages of sufficient magnitude having a frequency at or near 60 Hz., and upon such detection, a reactance means is responsive to open the connection between the premises telephone installation and the external telephone distribution line.

Abstract: A method and means for livestock record keeping. The means comprises a frame, with a rotatable wheel mounted on the frame, the wheel having a plurality of card holding slots radially positioned therearound, with the frame having a marking path positioned around the periphery of the rotable wheel. The method comprises determining a specific date on which a work function is to be performed, marking the day to provide a marked path, and moving at daily increments a symbol representing a given animal along said marked path so that when said symbol and a mark on the marked path coincide, a livestock keeper will know when a certain work function is to be performed.