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.
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 American microphone, which uses the Dynamic/Moving Coil element with the Ribbon/Velocity element. It has a Multi-Pattern polar response. It's date of manufacture is uknown.
This is a dual element American microphone, which uses the Dynamic/Moving Coil element with the Ribbon/Velocity element. It has a Multi-Pattern polar response, and it was manufactured circa 1950.