Western Well Tool, Inc.

Bruce Norman Moore

Duane Bloom

James W Estep

Kwang M Yoo

Rudolph Ernst Krueger, Iv

A sensor assembly including a sensor mounted on the piston and a transmitter mounted on either the piston or cylinder. Preferably the transmitter includes a wheel which engages the wall of the cylinder so as to rotate as the piston reciprocates within the cylinder. The wheel includes one or more magnets which emit a magnetic field that is received by the sensor as the wheel rotates whereby the sensor provides a signal indicative of the rotation of the wheel. The sensor then sends the signal to a logic component which determines the direction, travel and position of the piston within the cylinder.

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Aliso Viejo, CA, United States of America

Bruce Norman Moore