A pressure responsive assembly including an actuator rod coupled to a pressure source through a rolling type diaphagm. The other end of the actuator rod is connected to a wiper assembly. A first part of the wiper assembly contacts a coil of resistance wire to provide a first signal indicative of the...http://www.google.com/patents/US4648277?utm_source=gb-gplus-sharePatent US4648277 - Pressure responsive assembly
