When it comes to the field of medicine we understand the worth of quality, effectiveness, safety and hygiene. To incorporate all these factors in our Crankcase we have developed technologically advanced manufacturing facility headquartered in nanjing, Jiangsu, China, operating under Own Lisence.Owing to our reliable company profile in the industry we have secured Chile,Mexico,New Zealand,Russian Federation,United States of export market share reaching estimated export ratio value of US$10 Million - US$50 Million, based on 11 Years .Chang qing group Professional Association came into being back in 2009 as doorphone,door entry and intelligent security systems Manufacturer and Supplier. Starting off with US$50 Million - US$100 Million was quite a bit of a challenge but soon we grew into a successful entity, now holding Approx 0.8 Million US Dollar of annual revenue.