A Hungarian engineer and inventor, Goldmark immigrated to the US in 1933 and went to work in the Columbia Broadcasting System (CBS) laboratories. There he developed the first commercial color television system, but it was not compatible with existing black-and-white television sets and was soon superseded by one that was. Later, he developed the system that would allow the US Lunar Orbiter to relay photographs from the Moon to Earth. What did he invent that revolutionized the recording industry? Discuss
Source: The Free Dictionary