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Full range electroacoustic transducers

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1. ELECTRODYNAMIC TRANSDUCER COMPRISING MEANS TO ESTABLISH A SUBSTANTIALLY TIME-CONSTANT SHEET-FORM FIELD OF MAGNETIC FLUX EXTENDING OVER A PRESCRIBED AREA, SAID FLUX MEANS COMPRISING FIRST POLE MEANS LOCATED SUBSTANTIALLY ADJACENT A MID-REGION OF SAID AREA AND SECOND POLE MEANS LOCATED SUBSTANTIALLY ADJACENT AT LEAST A PORTION OF THE PERIPHERY OF SAID AREA, THE LINES OF FORCE OF SAID FIELD EXTENDING BETWEEN SAID FIRST AND SECOND POLE MEANS IN LIKE SENSE FROM THE PERIPHERY TO SAID MID-REGION, THE AREA OF SAID FIRST POLE MEANS CONFRONTING SAID FIRST-NAMED AREA BEING A MINOR FRACTION OF SAID FIRST-NAMED AREA, A SUBSTANTIALLY IMPERFORATE MEMBRANE COATED ON ONE SIDE
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