Carbon microphone
The first microphone that enabled proper voice telephony was the (loose-contact) carbon microphone (then called transmitter). This was independently developed around 1878 by David Edward Hughes in England and Emile Berliner and Thomas Edison in the US. Although Edison was awarded the first patent in mid-1877, Hughes had demonstrated his working device in front of many witnesses some years earlier, and most historians credit him with its invention.
American Microphone
Fern A. Yarbrough founded the American Microphone Company in Los Angeles in the 1930s. The company supplied microphones for broadcast, recording, and live sound. The broadcast and film industries used the American D-22 and D-33 Microphones extensively, in part because of their modern sleek looks and tapered design.