Quotables
"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 5552646 | Compact control and monitoring switch A device for control and monitoring of pressure in a system combines a conventional three pole pressure switch with the following additional features: (1) a lock mechanism with three influencing input factors and a single resulting output contact action, ... | 09/03/1996 |
| 4499921 | Three-way air valve A three-way air valve whose housing has connection openings for a compressed air power line, a line running to the load and an air let-off opening, the load opening being joined up with the power opening in one position of the valve and with the air let-o... | 02/19/1985 |
| 4273081 | Vent valve for engine cooling systems A check valve (32) comprises a housing (33) having an inlet (34) and an outlet (40) defined therein and first (43) and second (45) ramp surfaces are defined in the housing (33) at varying acute angles (a,b) relative to a longitudinal axis (X) of the valve... | 06/16/1981 |
