A Method of Power or Signal Transmission to a Moving VehicleBell Laboratories Memorandum, July 19, 1950.

This note describes a circuit for power or signal transmission or both to an object which may be placed anywhere on a surface in any orientation. The transmission is accomplished without trailing wires or an overhead trolley system. The circuit may have applications in the toy field for remotely controlled automobiles, in factories and warehouses for supplying power to fork lifts and delivery trucks, and in other fields.