first sci-fi TV shows to precede Star Trek

A discussion came up with some friends this past weekend after we saw Star Trek about which sci-fi television programs came before Star Trek. Here’s what I found:

1949-55: Captain Video (small screen version of Buck Rogers)
1950-55: Space Patrol
1953-54: Rod Brown of the Rocket Rangers
1954-55: Flash Gordon
1955-57: Science Fiction Theatre
1959-64: The Twilight Zone
1963-65: The Outer Limits
1965-68: Lost in Space
1966-69: Star Trek
Star Trek ran for only three years?