Does anyone know of a human defense equipment manufacturer with better product quality? How about the price of human defense equipment?

Protection of closed doors, closed doors, explosion-proof wave suspension plate valve, blocking frame of these human defense equipment must be used to manufacturers of equipment, we just bought a number of years ago, the human defense equipment, selected a number of companies, Xi'an do better Xi'an Shield real equipment company, Xi'an Dingxing automatic control equipment limited company, the blue sky Golden Shield equipment company, after negotiating with the several, each with its own advantages and disadvantages: Xi'an Shield time equipment companies The product range is more abundant, but the price is higher, and finally selected to buy in Xi'an Dingxing Automatic Control Engineering Co. Their contact information forgot, you can Baidu search "Xi'an Dingxing Automatic Control Equipment Co., Ltd.", the address seems to be outside the West Gate, "Renren Le" near the supermarket! Hand all write forget, the owner remember to give me points oh!