US5275005-A -- GB2102931-A   SNAMPROGETTI SPA (SNAM)   LAMANTIA G,  BELLITTO G,  FAILLA B,  FABBRI C;  SU1606828-A   ;  US2603310-A   ;  US2880592-A   ;  US4061481-A   ORTLOFF CORP (ORTL-Non-standard)   CAMPBELL R E,  LAWRENCE J B,  TONNE R R;  US4157904-A   ORTLOFF CORP (ORTL-Non-standard)   CAMPBELL R E,  WILKINSON J D;  US4171964-A   ORTLOFF CORP (ORTL-Non-standard)   CAMPBELL R E,  WILKINSON J D,  RAMBO C L;  US4251249-A   RANDALL CORP (RAND-Non-standard)   GULSBY J G;  US4278457-A   ORTLOFF CORP (ORTL-Non-standard)   CAMPBELL R E,  WILKINSON J D;  US4368061-A   TECHNIP CIE FR ETUD (TCHP)   MESTRALLET J,  HECK G,  KAISER V;  US4453958-A   GULSBY ENGG INC (GULS-Non-standard)   GULSBY J G,  COOK G D;  US4592766-A   LINDE AG (LINM)   KUMMANN P,  RANKE G;  US4596588-A   GULSBY ENG INC (GULS-Non-standard)   COOK G D;  US4600421-A   LINDE AG (LINM)   KUMMANN P;  US4617039-A   ORTLOFF CORP (ORTL-Non-standard);  PRO-QUIP CORP (PROQ-Non-standard);  ELCOR CORP (ELCO-Non-standard)   BUCK L L;  US4657571-A   SNAMPROGETTI SPA (SNAM);  US4676812-A   LINDE AG (LINM);  KUMMANN P (KUMM-Individual)   KUMMANN P;  US4687499-A   MCDERMOTT INT INC (MCDE-Non-standard)   AGHILI H K;  US4698081-A   MCDERMOTT INT INC (MCDE-Non-standard)   AGHILI H K;  US4711651-A   KELLOGG CO M W (PULL);  KELLOG CO (KELL)   SHARMA S,  HILL D K,  DURR C A;  US4718927-A   LINDE AG (LINM)   BAUER H,  SAPPER R;  US4720294-A   AIR PROD & CHEM INC (AIRP)   LUCADAMO G A,  ROWLES H C;  US4738699-A   FLEXIVOL INC (FLEX-Non-standard)   APFFEL F P;  US4752312-A   RANDALL CORP (RAND-Non-standard)   PRIBLE D E;  US4793841-A   LINDE AG (LINM)   BURR P S;  US4851020-A   MCDERMOTT INT INC (MCDE-Non-standard)   MONTGOMERY G J;  US4854955-A   ELCOR CORP (ELCO-Non-standard)   CAMPBELL R E,  WILKINSON J D,  HUDSON H M;  US4869740-A   ELCOR CORP (ELCO-Non-standard)   CAMPBELL R E,  WILKINSON J D,  HUDSON H M;  US4881960-A   LINDE AG (LINM)   RANKE G,  DIEHL E;  US4889545-A   ELCOR CORP (ELCO-Non-standard)   CAMPBELL R E,  WILKINSON J D,  HUDSON H M;  US5114451-A   ELCOR CORP (ELCO-Non-standard)   RAMBO C L,  WILKINSON J D,  HUDSON H M