This is a patent for a unidirectional microphone filed by A.M. Wiggins on January 11, 1954. The patent describes a microphone that is designed to pick up sound from one direction only. This is achieved by using a diaphragm that is mounted in a housing that has a hole on one side only. The sound waves that enter the hole are then directed to the diaphragm, which converts them into an electrical signal.
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