The collection comprises:
- Signed minute book of general and board meetings, December 1936-January 1947 (BEN 1).
- Signed minute book of board meetings, January 1947-March 1948 (BEN 2).
- Signed minute book of general meetings, March 1947-March 1948 (BEN 3).
The minute books record the activities, finance and share ownership of the company. Only BEN 1 contains significant references to the company's operational activity. This series of minute books is incomplete. If earlier volumes survive, their location has not been ascertained.