The Neumann CMV 3 condenser microphone, from 1928, was developed by Georg Neumann for his own company, which he had started in Berlin.
Although condenser microphones had been manufactured in the US before, this was the first to be mass-produced. The CMV 3A soon followed, featuring interchangeable elements to achieve different recording patterns. It was also the first reliable condenser microphone. It quickly earned the nickname ‘Hitler bottle’ because the Nazi dictator was often seen with it.