A successful licensing deal by this company originally manufactured by Miles Laboratories was advertised with the jingle, "Ten million strong and growing!"  
Daws Butler and Don Messick worked for this company for three decades.  This company was the first to figure out how to produce works on a budget of $30 per foot rather than the customary $200.  The founders of this company anonymously made commercials for I Love Lucy so as to not be discovered by their former employer, MGM.   A successful licensing deal by this company originally manufactured by Miles Laboratories was advertised with the jingle, "Ten million strong and growing!"  The Ruff and Ready Show was the first of its "streamlined" programs made for (*) children, which used multi-level characters to reduce movement and frequently recycled backgrounds.  This company provided the content for the Cartoon Cartoons block on Cartoon Network.  Its characters such as The Great Gazoo and Barney Rubble were profitably turned into vitamins.  For 10 points, name this doubly-eponymous animation company behind The Flintstones.
Daws Butler and Don Messick worked for this company for three decades.  
Hanna-Barbera Productions, Inc. [or H-B Enterprises; or Hanna-Barbera Cartoons]