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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 4123637 | High voltage air disconnect switch incorporating a puffer-type load break switch An air disconnect switch incorporates a unique arrangement of an ice breaking self-polishing current transfer horn arrangement which transfers the current to a puffer-type interrupter to effect circuit interruption prior to the disconnect switch being ful... | 10/31/1978 |
| 4121075 | Double-break puffer-type compressed-gas circuit-breaker A double-break puffer-type compressed-gas circuit-interrupter is provided having a common piston-and-cylinder arrangement for simultaneously forcing a blast of compressed gas through suitably-disposed jet apertures into a pair of serially-established arcs... | 10/17/1978 |
| 4103130 | Resistor applications for high-power circuit breakers A resistor assembly, together with a serially-connected resistor break, is connected in parallel, or shunting relationship, to an interrupting assembly, and arranged so that the resistor contacts remain closed while the main power-interrupting contacts op... | 07/25/1978 |
| 4082932 | High-voltage electric equipment cell Electrical equipment cell of the air insulated type, comprising a switch which connects a first plug which is live, to a second plug, on either side of a wall, the switch being arranged in an assembly formed by a metallic tank fixed on the wall and by two... | 04/04/1978 |
| 3987261 | Axial blast puffer interrupter with multiple puffer chambers A puffer interrupter has two axially spaced movable pistons fixed to the movable contact. A fixed barrier is disposed between the two pistons and a further fixed barrier is positioned at the end of the cylinder chamber. The two fixed barriers form three v... | 10/19/1976 |
