Abstract: A device for cutting out non-essential loads in a generator and battery-fed electric plant includes a voltage detecting unit connected across the terminals of the battery. The detecting unit may be a relay. Whenever the voltage at the terminals falls below a predetermined level, the detecting unit effects the disconnection of the non-essential load or loads from the terminals of the battery and generator, while allowing the essential load or loads. The detecting unit preferably includes a differential amplifier having one of its inputs connected to a voltage divider connected in parallel with the battery and its second input coupled to a source of reference potential.

Abstract: The glass pane of a vehicle window is provided on the surface of its central viewing area with a plurality of spaced, parallel linear heating resistors. First and second buses, disposed laterally of the central viewing area, extend transversely of the resistors and supply electric power thereto. A pair of moisture sensing, electrically conductive probes are provided on the pane at widely spaced zones away from the central viewing area. Each probe includes a first portion coextensive in length with a resistor and running parallel thereto. At least one of the probes has a second portion running parallel to one of the buses.

Abstract: A multi-band receiving antenna is supported on a windowpane for a radio-receiving set having a single antenna input socket. The antenna has a fishpole-type section which principally contributes to the reception of the metric wave band. A frame section, which runs parallel to the rim of the windowpane, principally contributes to the reception of the medium wave band. Each of the two sections contributes furthermore in a substantial measure, in the order of 10 - 20%, to the reception of signals having a frequency included in the band which is principally received by the other section. The impedance of the metric wave section is adapted by a spirally formed arrangement of the conductor or conductors of the frame portion of the antenna starting from the antenna terminal. The spiral forms an inductance of 0.2 - 0.5 .mu.H over an area of 5 - 15 cm.sup.2.

Abstract: A device for cutting out non-essential loads in a generator and battery-fed electric plant includes a voltage detecting unit connected across the terminals of the battery. The detecting unit may be a relay. Whenever the voltage at the terminals falls below a predetermined level, the detecting unit effects the disconnection of the non-essential loads from the terminals of the battery and generator.

Abstract: A multi-band windshield or window antenna has a fishpole-type conductor for metric wave band signal reception, the fishpole-type conductor having a free upper end, which may be split or folded back upon itself. At least one second conductor is provided for the reception of medium wave band signals. Each second conductor is connected to a common terminal with the fishpole-type conductor, extends along adjacent at least a portion of a first horizontal rim of the windshield, is bent back upon itself, extends vertically parallel to said fishpole-type conductor, horizontally adjacent to a second horizontal rim of the windshield and then vertically adjacent to a vertical rim of the windshield.

Abstract: A multiband antenna for window panes includes a frame-type antenna component and a fishpole-type antenna component. The two components have a common output terminal. The fishpole component is free of any cross bar. At least one leg of the frame-type component which runs along the lower rim of the window is provided with a succession of horizontally directed S-shaped loops, each loop having a length corresponding to an uneven multiple of wave lengths corresponding to the central frequency of the metric band.

Abstract: A multiband antenna as applied to a window pane, such as a windshield, includes a terminal which is to constitute a connection to a receiver. One or two conductors are attached to the terminal and extend vertically upward toward the top rim of the pane, are bent or branched so as to extend substantially parallel to and closely spaced from the top rim, side rims and bottom rim of the pane. End portions of the two conductors or branched single conductor are looped back and extend parallel to the legs which run parallel to the rims.

Abstract: The glass pane of a vehicle window is provided on the surface of its central viewing area with a plurality of spaced, parallel linear heating resistors. First and second buses, disposed laterally of the central viewing area, extend transversely of the resistors and supply electric power to the resistors. A miniature transistorized control circuit mounted at a corner of the pane away from the central viewing area controls the supply of power to the buses. A plurality of moisture sensing, electrically conductive probes are provided on the pane at widely spaced zones and are connected to the input terminal means of the control circuit. Each probe includes a first portion coextensive in length with a resistor and running parallel thereto. One of the probes has a second portion parallel to and closely spaced from one of the buses. The control circuit responds to detection of fogging of the pane by anyone of the probes.