What sitcoms aired in the 1940s, and do they survive at all?

I know of the following:
"Pinwright's Progress" (1946-1947, BBC) - No surviving episodes (ability to record live TV did not exist at the time)
"Mary Kay and Johnny" (1947-1950, DuMont, then CBS, then NBC) - At least 1 surviving episode
"The Laytons" (1948-1949, DuMont) - No surviving episodes
"The Growing Paynes" (1948-1949, DuMont) - at least 2 surviving episodes, maybe 4
"The Life of Riley" (1949-1950, NBC) - Complete run survives of this early filmed series

What other sitcoms aired in the 1940s?

What is the oldest surviving British sitcom episode? Would I be correct to presume it comes from the 1950s?



Du Mont is always stimulated by Milton Berle's horizontal resolution, if not his jokes