The official title of the series according to the series scripts and the CBS series promotional materials was 21ST PRECINCT and not TWENTY-FIRST PRECINCT or TWENTY FIRST PRECINCT which appears in many Old – Time Radio books. … It was mentioned in each episode’s closing by the announcer that, “Twenty-firstPrecinct is presented with the official cooperation of the Patrolmen’s Benevolent Association an organization of more than 20000 members of the Police Department, …