The Business files series contains documents related to Jennings’ career. His military service in World War II is recorded here with ration cards, identification cards, and service records. Following the war, Jennings relocated to occupied Japan for RCA, and this series contains his occupation identity cards and memoranda related to communications issued by the Supreme Commander for the Allied Powers (SCAP).

The majority of this series consists of records related to Jennings’ daily operations for RCA which includes correspondence on tariffs and accounting, cable agreements, meeting notes from cable carrier groups, and reference publications and regulations.

After he retired, Jennings signed a contract with Japanese carrier KDD to write a book on Japanese telecommunications. The full draft of this book is in this series, as are two original copies of a book of anecdotes Jennings wrote about life in Japan.

These folders are arranged alphabetically by subject.