Consider the Jack Benny Show lasted until 1955.  Amos 'n' Andy changed formats a bit and lasted until the late 1950's.  Burns...

1949 [I also had to edit the size, this thing was huge]

First, another really cool ad from CBS Radio (I love these) with it's caricature drawings. Lo and behold, there is Dick York , someon...

Ozzie & Harriet?  Hmmm.  What is up with that?