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MECHANISM FOR CONTROLLING INDUSTRIAL MACHINERY AND BOILERS COMPRISING A DRIVE MOTOR, LIMIT SWITCHES AND REDUCTION GEARING ADAPTED TO BE MOUNTED UPON A ROTATABLE PART OF A CONTROL SYSTEM WHICH RESPONDS TO A PRIMARY CONTROL SIGNAL TO POSITION A CONTROL ELEMENT, SAID MECHANISM OPERATING IN RESPONSE TO A SECONDARY CONTROL SIGNAL TO MODIFY THE OPERATION OF SAID CONTROL ELEMENT FOR RESPONSE TO BOTH PRIMARY AND SECONDARY CONTROL SIGNALS