○ Dust collection devices / deodorization devices / local exhaust devices / pneumatic transport devices / centralized cleaning devices ○ Harmful gas treatment devices / exhaust gas treatment devices / heat exchangers / gas cooling towers / waste and recycling treatment devices ○ Exhaust fans and silencing devices / environmental measurement and analysis services ○ Sales of environmental monitoring devices and software / other pollution prevention and environmental-related equipment ◎ Installation work related to the above, piping work, electrical work, civil engineering and demolition work, maintenance management, engineering, and consulting related to environmental conservation