An improved cable feed-through apparatus and method for wellheads including a unitary shell having a plurality of knock-down components therein. A plurality of parallel spaced conductors are inserted through rigid spacing and compression rings with upper and lower exposed ends for providing coupling...http://www.google.de/patents/US4154302?utm_source=gb-gplus-sharePatent US4154302 - Cable feed-through method and apparatus for well head constructions
