 About this time, the company developed its first patents, the moving coil technology and the principle of mass load membranes, allowing its products to have extended frequency ranges.With the creation of the D12 microphone in 1953, AKG achieved international fame, setting the standard for voice transmissions.Being the world's first dynamic cardioid microphone, it possessed excellent sonic qualities for that time, making its way into radio stations and recording studios from across the world.