The collection comprises signed directors' minute book covering 1936-1948 (BEZ 1) and a register of directors covering 1932-1939 (BEZ 2).
The minute book does not contain the first minutes of the company. If earlier minute books of the company are still in existence, their location has not been ascertained. Earlier minutes in this volume concentrate on the financial and share aspects of the company while later minutes provide more specific details about the company's operational and management activities. The register of directors contains details of share ownership.