Lang 16D, 16CD, 20D and 20CD Lathes Manual LANG 16D, 16CD, 20D and 20CD Lathes: Detailed and well-illustrated Instruction, Maintenance and Spare Parts Manual. Instructions for the BHI Multi-disc clutches. Manufacturers: Lang Models: 16CD 16D 20CD 20D Contents: Operators Manual Maintenance Manual Electrical Diagrams