(2) Maintenance procedures, maintenance manuals and parts catalogue. ?
(3) Maintain the developed special tools and test equipment. ?
(4) Spare parts distribution network. ?
(5) Establish maintenance and simple fault maintenance outlets. ?
(6) Effective user complaint procedures.
This can only be a reference for you.
+++Ba Fen
Unfortunately, this book is not included in the Complete Works of Marx and Engels.
Chinese version: The Complete Works of Marx and Engels (Volume 19), Beijing: People's Publishing Hou