AKG introduced the K 140 in 1974 and the K 240 Monitor in 1975, which became the most widely used headphones in recording studios and broadcast facilities worldwide. Generations of musicians and audio engineers use these AKG products to create great mixes, hit songs and albums cherished by millions around the world.
https://www.amazon.com/AKG-K240STUDIO-Semi-Open-Professional-Headphones/dp/B0001ARCFA