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ลำดับที่	LC	คำอธิบาย
81		Streets
82		Pedestrian facilities
83		Sidewalks. Footpaths. Flagging
84		Curbs. Curbstones
85		Railroad engineering and operation
86		High speed ground transporation
87		Railway construction
88		Railway equipment and supplies
89		Railway operation and management
90		Local and light railways
91		Elevated railways and subways
92		Electric railways
93		Bridge engineering
94		Building construction
95		Systems of building construction Including fireproof construction, concrete construction
96		Details in building design and construction Including walls, roofs
97		Maintenance and repair
98		Buildings: Construction with reference to use Including public buildings, dwellings
99		Construction by phase of the work (Building trades)
100		Environmental engineering of buildings. Sanitary engineering of buildings
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