Stereophonic transducer means

Claim 1

THE COMBINATION, COMPRISING A PAIR OF LIKE TWIST RESPONSIVE TRANSDUCER ELEMENTS HAVING SUBSTANTIALLY PARALLEL TWIST AXES, EACH OF SAID ELEMENTS BEING OPERABLE TO PRODUCE AN ELECTRICAL SIGNAL IN RESPONSE TO ELEMENT TWISTING ABOUT SAID TWIST AXES, SAID TRANSDUCER ELEMENTS HAVING AXIALLY SPACED APART FIXED AND FREE END PORTIONS, AN ASSEMBLY MOUNTING SAID ELEMENTS WITH SAID FREE END PORTIONS THEREOF LATERALLY SPACED APART, SAID ASSEMBLY INCLUDING A HOUSING FOR SAID ELEMENTS, AND ACTUATING MEANS INCLUDING A PIVOTLESS YOKE CONNECTED WITH SAID ELEMENT FREE END PORTIONS FOR TWISTING ONE ELEMENT WITHOUT SUBSTANTIALLY TWISTING SAID OTHER ELEMENT IN RESPONSE TO TRACKING MEANS MOVEMENT VARIATION IN ONE CHANNEL OF THE GROOVE AND FOR TWISTING SAID OTHER ELEMENT WITHOUT SUBSTANTIALLY TWISTING SAID ONE ELEMENT IN RESPONSE TO TRACKING MEANS MOVEMENT VARIATION IN THE OTHER CHANNEL OF THE GROOVE, EACH OF SAID ELEMENTS COMPRISING A LENGTHWISE CONTINUOUS CYLINDRICAL BODY OF PIEZOELECTRIC MATERIAL AND A PAIR OF SPACED ELECTRODES EXTENDING LONGITUDINALLY ON A SURFACE OF SAID BODY AND WINDING ABOUT THE AXIS THEREOF SO THAT TWISTING OF THE BODY ABOUT SAID AXIS RESULTS IN A VOLTAGE CHANGE ACROSS SAID ELECTRODES.