CBS Television. It was not uncommon for television networks, studios and sponsors of television programs to use either a public relations firm or advertising agency for distribution of publicity material. This was distributed by the Bureau of Industrial Service, which was a division of advertising agency Young & Rubicam.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.