J. Walter Thompson, the advertising agency for Lux Radio Theatre's sponsor, Lever Brothers. It was not uncommon for sponsors of programs, networks or studios to use either ad or publicity agencies to distribute publicity material.
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.