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These bumpers are the most well known as they usually were animated with the Icon Ghost doing something before stating "We're be back after these messages" or "We now return to the Real Ghostbusters". Later seasons went to an almost Ident Bumper type with only audio announcer. Network Bumpers can be found here.
Ident Bumpers
These bumpers acted much like Break Bumpers, except they were a still of the logo for the show and music of the show. These were mostly used during the middle of the hour formatted broadcasts to keep the viewer waiting.
Commercial Bumpers
Not to be confused with RGB ads, it was used to promote that the show "has more to come". Usually these could be seen in at the end of the first episode of an hour block. They were used second half of Season 3 to the end of Season 6. It would show clips from either one show or a number of shows, and state they are coming back.
List
Note that we count Syndicated as Season 2, and ABC year 2 as Season 3.