Coventry Die Heads Spare Parts Manual with Illustrations and useful Cross-Sectional diagrams of the various units including all "D" types. (Herbert)

Cri-Dan Type D High-speed Threading Machine (also marketed by Herbert): Operator's Manual.

Herbert "D" fitted with Nickols Automatics (EMI) Controls. Detailed Operator's Instruction and Maintenance Manual for this single-spindle Auto lathe.