US4925751-A -- US4228226-A   ;  US4303748-A   ANVAR AGENCE NAT VALORISATION (ANVR)   ARMAND M,  DUCLOT M;  US4547440-A   ;  US4589197-A   UK ATOMIC ENERGY AUTHORITY (UKAT)   NORTH J M;  US4792504-A   MHB JOINT VENTURE (MHBJ-Non-standard);  DEVERS M S CO (DEVE-Non-standard)   SCHWAB G,  LEE M T;  US4830939-A   MHB JOINT VENTURE (MHBJ-Non-standard)   LEE M T,  SHACKLE D,  SCHWAB G;  EP396324-A -- DE3829541-A   RICOH KK (RICO)   OHSAWA T,  KABATA T,  KIMURA O,  SACHIKO Y;  EP61962-A   ;  EP68307-A   GIPELEC SA (GIPE-Non-standard);  SAFT SOC ACCUM FIXES TRACTION (ACCF)   DUCHANGE J P,  GABANO J P;  EP119912-A   SOC NAT ELF AQUITAINE (ERAP);  HYDRO-QUEBEC (QUGO)   ARMAND M,  MULLER D,  DUVAL M,  HARVEY P E;  EP260847-A   IMPERIAL CHEM IND PLC (ICIL)   BALLARD D G H,  CHESHIRE P,  PRZEWORSKI J E;  EP298802-A   SOC NAT ELF AQUITAINE (ERAP);  HYDRO-QUEBEC (QUGO);  GRANLEY PROD LONDON LTD (GRAP)   MULLER D,  CHABAGNO J M,  DUVAL M;  EP385802-A   FAUTEUX D G (FAUT-Individual);  MHB JOINT VENTURE (MHBJ-Non-standard);  DEVERS MS CO (DEVE-Non-standard);  HOPE & LANDSGUARD ENG IN (HOPE-Non-standard)   FAUTEUX D G,  MOORE M J,  BLONSKY P M;  FR2550015-A   SORAPEC SOC RECH SA (SORA-Non-standard)   AGENMULER P,  BUGNET B,  DELMAS C,  DONIAT D,  KBALA M,  LEVASSEUR A,  RABARDEL L;  JP63244572-A   MATSUSHITA ELEC IND CO LTD (MATU);  JAPAN SYNTHETIC RUBBER CO LTD (JAPS)   TONOMURA T,  KONDO S,  NAGATA M,  YASUDA T;  US4808496-A   MHB JOINT VENTURE (MHBJ-Non-standard);  HOPE H F (HOPE-Individual)   HOPE H F,  HOPE S F;  EP396324-B1 -- DE3829541-A   RICOH KK (RICO)   OHSAWA T,  KABATA T,  KIMURA O,  SACHIKO Y;  EP61962-A   ;  EP68307-A   GIPELEC SA (GIPE-Non-standard);  SAFT SOC ACCUM FIXES TRACTION (ACCF)   DUCHANGE J P,  GABANO J P;  EP119912-A   SOC NAT ELF AQUITAINE (ERAP);  HYDRO-QUEBEC (QUGO)   ARMAND M,  MULLER D,  DUVAL M,  HARVEY P E;  EP260847-A   IMPERIAL CHEM IND PLC (ICIL)   BALLARD D G H,  CHESHIRE P,  PRZEWORSKI J E;  EP298802-A   SOC NAT ELF AQUITAINE (ERAP);  HYDRO-QUEBEC (QUGO);  GRANLEY PROD LONDON LTD (GRAP)   MULLER D,  CHABAGNO J M,  DUVAL M;  EP385802-A   FAUTEUX D G (FAUT-Individual);  MHB JOINT VENTURE (MHBJ-Non-standard);  DEVERS MS CO (DEVE-Non-standard);  HOPE & LANDSGUARD ENG IN (HOPE-Non-standard)   FAUTEUX D G,  MOORE M J,  BLONSKY P M;  FR2550015-A   SORAPEC SOC RECH SA (SORA-Non-standard)   AGENMULER P,  BUGNET B,  DELMAS C,  DONIAT D,  KBALA M,  LEVASSEUR A,  RABARDEL L;  JP63244572-A   MATSUSHITA ELEC IND CO LTD (MATU);  JAPAN SYNTHETIC RUBBER CO LTD (JAPS)   TONOMURA T,  KONDO S,  NAGATA M,  YASUDA T;  US4808496-A   MHB JOINT VENTURE (MHBJ-Non-standard);  HOPE H F (HOPE-Individual)   HOPE H F,  HOPE S F;  JP3202216-B2 -- JP59182844-A   SOC NAT ELF AQUITAINE (ERAP);  HYDRO-QUEBEC (QUGO)   ARMAND M,  MULLER D,  DUVAL M,  HARVEY P E;  JP63239779-A   IMPERIAL CHEM IND PLC (ICIL)   BALLARD D G H,  CHESHIRE P,  PRZEWORSKI J E;  JP01503741-W   ;  WO1988010520-A