"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 5789700 | Grounding device with mounting brackets A grounding device for positively grounding a broken electrical conductor has a primary body having a mounting post extending therefrom. A bracket is fixed to the pole carrying the conductor, and a clamp connects the mounting post to the bracket. To raise... | 08/04/1998 |
| 5359167 | Whip for a high tension section switch A whip usable in a high tension section switch, in particular a vertically-opening switch, the whip comprising a flexible metal rod whose section is a truncated circle whose area diminishes progressively from the base of the whip to its tip.... | 10/25/1994 |
| 4757169 | Electric switchgear having guiding means serving for positioning within a switchboard cell A circuit breaker comprises base angles to which sliding rails are connected. To the sliding rails are fastened coupling claws which have recesses for extending over coupling pins of a positioning drive. By posts of the coupling claws provision is made in... | 07/12/1988 |
| 4654540 | Group operated circuit disconnect apparatus for overhead electric power lines A group operated electric circuit disconnect apparatus for a plurality of overhead electric power distribution lines carried on poles. The apparatus includes an elongated extruded base mounted on and extending transversely of a pole. A bracket is connecte... | 03/31/1987 |
| 4256934 | Disconnecting switch arrangement A disconnecting switch arrangement for a high voltage disconnecting switch equipped with an earthing device for use particularly in a metal clad insulated substation. The arrangement comprising a disconnecting unit, an earthing unit and an actuating unit ... | 03/17/1981 |
| 4136372 | Protective boot for a high voltage circuit interrupter A protective boot of flexible, insulating material for use in covering the grounded portions of a circuit interrupter and thereby preventing accidental shorting between the current carrying sections of the circuit interrupter and the grounded portions. Th... | 01/23/1979 |
| 4112268 | Double side air break disconnecting switch A double break air disconnecting switch for high voltage electric power installations having a switchblade fixed to a rotatable center insulator for unitary movement therewith and fixed jaw contacts mounted at the ends of the switchblade. A pivoting conta... | 09/05/1978 |
| 3932715 | High voltage switch A high voltage switch including a rotatable insulating column adjusted by means of an operating arm assembly including two bolt circles of equal radius and unequal spacing.... | 01/13/1976 |