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"There is practically no chance communications space satellites will be used to provide better telephone, telegraph, television, or radio service inside the United States."
T. Craven, FCC Commissioner ; 1961
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| Number | Title | Issue Date |
| 5654634 | Method for detecting gaps to be bridged in the power supply of an electric rail vehicle A method for detecting gaps to be bridged in a power supply of an electric rail vehicle includes continuously sensing at least one conductor rail for gaps with at least one contact signal transmitter travelling ahead of a plurality of electrically interco... | 08/05/1997 |
| 4984349 | Method of and apparatus for emergency shutdown of production line A production line for manufacturing automobiles, for example, has a plurality of self-propelled carriages for carrying workpieces respectively thereon, the self-propelled carriages having respective first emergency shutdown circuits, and a plurality of au... | 01/15/1991 |
| 4745997 | Offset detecting device for trolley-assisted vehicles Offset condition detecting device for detecting offset condition of pantographs from overhead contact wires by means of electric current detected by a contact element mounted on the pantograph and insulated therefrom. The detection is made electrically an... | 05/24/1988 |
| 4340920 | Mine vehicle safety apparatus A mine safety system for use with a direct current power supply delivering power via a pair of conductors to the direct current load components of mining apparatus which includes a conductive frame electrically isolated from ground and at least one of the... | 07/20/1982 |
| 4116312 | Mine vehicle trolley pole It is common practice to provide electrically propelled mine vehicles, such as locomotives, people carriers and shuttle-cars, with solid wooden trolley poles. The lower end of such a pole is mounted on the vehicle and the upper end carries a trolley shoe ... | 09/26/1978 |
| 4042081 | Manual control of third rail power knockout Manual closure of a switch in a power-supply circuit to an explosive type bolt causes detonation of the bolt which releases a caged spring that thereupon is rendered effective to rock a lever in the direction to lift a current-collecting shoe out of engag... | 08/16/1977 |
