From the blog "BGE Journal"

Didn't know magnavox was bought out in 1974 , they were making versions of their game system until 1978. interesting. Didn't know coleco meant the conneticut leather company:)  Photo information in 1977, magnavox/atari/coleco all USA based companies dominated the gaming market. A telling thing that all three corporations are gone. in 1982, Atari was the distanced leader, while three other usa based makers , mattel had joined, aside japan's nintendo were all equal as second. Atar