![]() ![]() Google Patents US20080152172A1 - Electrostatic ultrasonic transducer, and ultrasonic speaker, audio signal reproduction method, ultra-directive sound system, and display apparatus using electrostatic ultrasonic transducer US20080152172A1 - Electrostatic ultrasonic transducer, and ultrasonic speaker, audio signal reproduction method, ultra-directive sound system, and display apparatus using electrostatic ultrasonic transducer ![]()
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