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Diagram of a bi-direcitonal microphone's polar response pattern.

This is a dual element Turner microphone, which uses the Dynamic/Moving Coil element with the Ribbon/Velocity element. It has an unknown polar response and date of manufacture.

This is a dual element Western Electric microphone, which uses the Dynamic/Moving Coil element with the Ribbon/Velocity element. It has a Multi-Pattern polar response. It was manufactured in 1938.