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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 5775199 | Rotary valve and directional valve combination The combination of a cylindrical rotary distribution valve which is supplied pressure fluid alternately at either end to sequentially supply and exhaust pressure fluid such as compressed air radially to a selectively reversible hoist motor and a direction... | 07/07/1998 |
| 4974625 | Four mode pneumatic relay A four-mode pneumatic relay includes a relay body defining four chambers, each coupled to a port. Two of the chambers are formed by a diaphragm assembly consisting of a rolling diaphragm coupled to an input post that drives a movable orifice shaft and a p... | 12/04/1990 |
| 4848392 | Solenoid on-off valve A solenoid on-off valve for opening or closing a flow channel passing through a valve chamber by alternately moving a plunger in the valve chamber with a solenoid and a return spring, comprises valve seats on both ends of the valve chamber, a valve head 1... | 07/18/1989 |
