...I think CBS owns syndication rights to at least part of "Bonanza" and all of "Gunsmoke." CBS, through its absorbing King World into their syndication unit, also owns "Branded" and "The Guns of Will Sonnett," both of which I haven't seen on cable *ever*.
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Some of the early Bonanza episodes were made at Paramount while later episodes of the show were made at Warner Brothers because when they aired the early 70's episodes of the show in reruns they showed the Warner Brothers logo at the end.
In the mid 80's, CBN and local stations started back up with reruns of Branded and The Guns Of Will Sonnett after for years not being in syndication(it aired very briefly in reruns during the late 60's and early 70's during the summer months), and I think reruns of the shows are still being seen today and mostly air during the early morning hours to fill gaps in timeslots.