(a) the royal water defense union is affiliated with the wang water protection technology company ltd. In the city of nakayama. It is an integrated enterprise that specializes in interior and exterior decorations, construction of wang water protection union stores to prevent water leaks and leaks. The wang water protection union has a considerable team to date, and works on leak-proof projects such as external walls, roofs, basements and bathrooms; the water defense union team, which relies closely on the talent, technology and water engineers of the headquarters, focuses on the construction and renovation of various types of housing, as well as on the maintenance of various types of waterproofing of outer walls and basements, opening up new areas of environmental protection, efficiency, cleanliness and safe waterproofness for exterior walls such as houses and old buildings, freeing the old house from constant retrofitting and leaks in the home! The rooftop company uses quality as the life of the enterprise, and all work is performed on a regular tour and after the rain, with no water leaks and quality objections to date. Specialized leak-proofing, house-proofing and renovation, exterior wall-repair cleaning and cleaning have specialized leak-proof techniques, specialized engineering management, and specialized water-proof construction teams. There are currently seven specialized technical guidance engineers, over 30 construction staff, specialized in various types of building water-proofing works, anti-corrosive temperature-proofing works, and anti-s seepage-proofing works。