British Standards Specification for Machine Cut Gears: A. Helical and Straight Spur by British Standards Institution
1940. No Edition Remarks. 47 pages. No dust jacket. Grey cloth. Full title: British Standards Specification for Machine Cut Gears: A. Helical and Straight Spur. Pull-out black and white graphs to rear of book. Binding remains firm. Pages have light tanning and foxing throughout. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Light marking to both boards.