9 WEIGHING, MEASURING, SIGNALING AND CONTROL UNITS, DEVICES AND INSTRUMENTS FOR OPERATION OF PLASTICS PROCESSING PLANTS, NAMELY, WEIGHT SCALES, PROGRAMMABLE ELECTRONIC AND ELECTROMECHANICAL CONTROLLERS, COMPUTER PROGRAMS FOR USE IN ELECTRONIC CONTROLLERS TO CONTROL THE INJECTION MOLDING OF MATERIALS AND MONITORING AND CONTROL DEVICES CONSISTING OF TEMPERATURE SENSORS, PRESSURE SENSORS, TIMERS, SOLENOID CONTROL VALVES AND MICROPROCESSORS FOR MONITORING AND CONTROLLING TEMPERATURE, TIME, AND PRESSURE IN CONJUNCTION WITH INJECTION MOLDING MACHINES