In shenzhen city, the registered address of the yongjing science and technology company ltd. Is located on the stone street street in the boang district of shenzhen city and on the first floor of the building a industrial park, with the registration authority being the department of pou-san and the legal representative being zheng qinghai. The general operations include the following: the development and application of a door-control system; the development and application of artificially intelligent research and development and system applications; the design, sale and installation of safe and secure products; the series of treasury-gate products; the store-room-gate series; the series of custom-protected doors; the closed doors, the ship-gate doors, the port-door doors, the closed windows, the closed windows, the blast-proofing and blast-proof doors; the design, construction and construction of the electronic intelligence control system for safety-proof products; the domestic trade; and the conduct of import and export operations. (except for items prohibited by laws, administrative regulations, state council decisions, restricted items subject to authorization for operation) and licensed to operate are: safe and secure production and maintenance of products; treasury door series, collection of store doors, closed doors to protect against piracy, ships ' doors, port doors, closed windows, blast-proof (explosive) and venting series of products, windows, walls, houseside doors, smart gun cabinets, specialized doors for gun storage, dangerous goods warehouse doors, secure storage doors, soundproof doors, human doors, nuclear power doors, water doors, rental safes, locking doors, fire doors, electronic intelligence control systems for anti-product engineering。