7 FLUID MILLS AND MIXING MACHINES, FLUID PUMPS, STIRLING ENGINES, AND METAL MECHANICAL AND DYNAMIC SEALS FOR USE ON STIRLING ENGINE PISTONS AND TURBINE BLADES (TO BE USED WITH MACHINES), ENERGY CONVERSION SYSTEMS, COMPRISING STIRLING ENGINES AND HEAT PUMPS DRIVING LINEAR ALTERNATORS, THERMAL OSCILLATORS, AND EXPANSION COMPRESSORS FOR THE ON-SITE CONVERSION OF THERMAL ENERGY INTO ELECTRICITY AND HEAT