;  WO9105030-A -- DE1921884-A   JOY MFG CO (JOYM);  DE2124010-A   STORD BARTZ IND A/S (STO-Non-standard);  THOR (THOR-Individual);  DE2831638-B   REGEHR U (REGE-Individual)   REGEHR U,  HANNEMANN H,  BULANG H S;  DE3147391-A   LINDE AG (LINM)   JUNGFER H,  HOFER H;  EP167702-A   KRUPP-KOPPERS GMBH (KOPS)   WOHNER H J,  PAPPMANN W,  DIEMER P;  GB1458238-A   CHUNG C K (CHUN-Individual);  US4129420-A   KOPPELMAN E (KOPP-Individual)   KOPPELMAN E;  US4318713-A   ALLIS-CHALMERS CORP (ALCM)   LEE G T,  LEES J N,  PUKITA P M;  US4477257-A   KOPPELMAN E (KOPP-Individual);  K-FUEL/KOPPELMAN PA (KFUE-Non-standard)   KOPPELMAN E,  MURRAY R G;  WO8909809-A   PRODUCT CONTROL LTD (PROD-Non-standard)   SOMEUS E;  EP494240-A1 -- DE1921884   JOY MFG CO (JOYM);  DE2124010   STORD BARTZ IND A/S (STO-Non-standard);  THOR (THOR-Individual);  DE2831638   REGEHR U (REGE-Individual)   REGEHR U,  HANNEMANN H,  BULANG H S;  DE3147391   LINDE AG (LINM)   JUNGFER H,  HOFER H;  EP167702-A   KRUPP-KOPPERS GMBH (KOPS)   WOHNER H J,  PAPPMANN W,  DIEMER P;  GB1458238-A   CHUNG C K (CHUN-Individual);  US4129420-A   KOPPELMAN E (KOPP-Individual)   KOPPELMAN E;  US4318713-A   ALLIS-CHALMERS CORP (ALCM)   LEE G T,  LEES J N,  PUKITA P M;  US4477257-A   KOPPELMAN E (KOPP-Individual);  K-FUEL/KOPPELMAN PA (KFUE-Non-standard)   KOPPELMAN E,  MURRAY R G;  WO8909809-A   PRODUCT CONTROL LTD (PROD-Non-standard)   SOMEUS E;  US5261936-A -- DE1921884   JOY MFG CO (JOYM);  DE2124010   STORD BARTZ IND A/S (STO-Non-standard);  THOR (THOR-Individual);  DE2831638   REGEHR U (REGE-Individual)   REGEHR U,  HANNEMANN H,  BULANG H S;  DE3147391   LINDE AG (LINM)   JUNGFER H,  HOFER H;  EP167702-A   KRUPP-KOPPERS GMBH (KOPS)   WOHNER H J,  PAPPMANN W,  DIEMER P;  GB1458238-A   CHUNG C K (CHUN-Individual);  GB2065500   HEAT EXTRACTOR CORP (HEAT-Non-standard)   BENSHMUEL D;  US2069389-A   ;  US2139827-A   ;  US4129420-A   KOPPELMAN E (KOPP-Individual)   KOPPELMAN E;  US4305909-A   PEABODY PROCESS SYST (PEAB-Non-standard)   WILLETT H P,  BAKKE E;  US4318713-A   ALLIS-CHALMERS CORP (ALCM)   LEE G T,  LEES J N,  PUKITA P M;  US4477257-A   KOPPELMAN E (KOPP-Individual);  K-FUEL/KOPPELMAN PA (KFUE-Non-standard)   KOPPELMAN E,  MURRAY R G;  WO8909809-A   PRODUCT CONTROL LTD (PROD-Non-standard)   SOMEUS E