The Push Pull System Co.,LTD. is specialized developing, manufacturing, selling company especially for mechanical door-lock and digital door-lock system. Swept gold prize at November, 2013 Korean patent show, awarded two prizes as well as 2 more special prizes at 2014 year in Moscow International new technology exhibition, We are also awarded Gold prize including 3 special prize and Gold and spcial prize winner at Pits-burg show in United States since the Pushpull System in one of a most evolutional and innovative top functioned & designed, Gold awarded at 2014 Seoul International Invention Fair and special awarded from Korea Invention Promotion Association Chairman as door lock system.