Multifunction acoustic device with direct current motor

• Main Author: CHOI, KI JUNG
• Format: Patent
• Language: English; French; German
• Published: 01.02.2006
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DEAF-AID SETS; DYNAMO-ELECTRIC MACHINES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FOR PERFORMING MECHANICAL WORK IN GENERAL; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; GENERATION; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; PERFORMING OPERATIONS; PUBLIC ADDRESS SYSTEMS; TRANSPORTING