Compilation Five Small Innovation by Chen Chuang (1 results)

paperback. Condition: New. Paperback. Pub Date: 2021-12-01 Pages: 226 Language: Chinese Publisher: Coal Industry Press 18 invention patents. utility model patents. etc. All of these achievements have high gold content. strong practicability. and obvious safety and economic benefits. This book is the crystallization of the sweat and wisdom of industrial workers who love and dedicate themselves to the five small innovative achievements. and truly reflects the efforts and dedication of the vast number of industrial worker.…