ELECTRICALLY OPERATED DEVICES OF VARYING SIZES ADAPTED FOR USE IN MIXING, PULVERIZING, GRINDING, CRUSHING, DILUTING, BLENDING, EMULSIFYING, DRY, LIQUID, GRANULAR, COMMINUTED, SOLID OR SEMISOLID MATERIALS, DENTAL ALLOYS AND AMALGAMATING EMULSIONS AND USED IN INDUSTRIAL RESEARCH, EDUCATIONAL, METALLURGICAL, CHEMICAL, DENTAL, MEDICAL AND PHARMACEUTICAL APPLICATIONS, ADAPTERS USED ON SAID DEVICES AND COMPRISING CLOSABLE MIXING CONTAINERS HAVING CLAMPING MEANS THEREON