Invention of the telephone
The carbon microphone 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.
Gauge Precision Instruments
In 2007 Chandler Bridges and Rob Chiarelli begin experimentation in loudspeaker and microphone design. In 2008 Gauge Precision Instruments introduces the ECM-87, their first cardioid condenser microphone. Gauge introduced the ECM-47 in 2009, their first multi-pattern Tube microphone. That year Gauge also introduced the USB-87, a Universal Serial Bus powered microphone designed specifically for use with the personal computer, and the ECM-84 and ECM-84SE, their first small diaphragm electret condenser microphone. In 2010, the company introduced the ECM-58, their first hand-held dynamic microphone. The ECM58 was discontinued in April, 2012 and the company introduced the ECM87 Stealth Microphone, an alternate version of the ECM87 Classic. In 2013, the company introduced the MP-1073, their first microphone preamplifier.