;  EP1834674-A2 -- US3497215-A   ;  US3566861-A   ;  US4687195-A   TRI-TECH INC (TRIT-Non-standard)   POTTS L L;  US5090690-A   HUANG K (HUAN-Individual)   HUANG K;  US5135447-A   LIFE FITNESS (LIFE-Non-standard)   ROBARDS C F,  CINKE S J,  WALTASTI S A,  KOHAN R,  ALEXANDER D J,  GUENTHER D G,  THUM D J,  LEON T;  US5180351-A   ;  US5195935-A   SF ENG (SFEN-Non-standard)   FENCEL S R;  US5222928-A   ;  US5238462-A   LIFE FITNESS (LIFE-Non-standard)   CINKE S J,  PLATT M K,  THUM D J;  US5318487-A   LIFE FITNESS (LIFE-Non-standard)   GOLEN E S,  OGLESBY G E,  ALEXANDER D J,  LEON T F,  QUAST R E,  HOOD R L,  THUM D J;  US20050181911-A1   ;  US6238321-B1   ;  US6758790-B1   NORTHLAND IND INC (NORT-Non-standard)   ELLIS P D;  US7771324-B2 -- US3497215-A   ;  US3566861-A   ;  US3592466-A   ;  US3970302-A   MCFEE R (MCFE-Individual)   MCFEE R;  US4346886-A   ;  US4496147-A   LITTLE INC ARTHUR D (LITT)   DECLOUX R J,  LOEFFLER H H,  MACCONKEY J S,  YONKERS E H;  US4529194-A   HAAHEIM G (HAAH-Individual)   HAAHEIM G; 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