In one aspect of the present invention, an apparatus for determining an extended length of a hydraulic cylinder is disclosed. A piston and rod are contained within a cylindrical housing of the hydraulic cylinder. A coil is wound about the rod and is attached to the piston and an end of the cylindrical...http://www.google.es/patents/US5438261?utm_source=gb-gplus-sharePatente US5438261 - Inductive sensing apparatus for a hydraulic cylinder
Inductive sensing apparatus for a hydraulic cylinder
