General projects: electronic vacuum device manufacturing; electronic component manufacturing; mechanical parts and components processing; metal cutting processing services; electronic vacuum device sales; seal manufacturing; seal sales; sales of non-ferrous metal alloys; import and export of goods; technology import and export; import and export agency; domestic trade agency; sales of solar thermal utilization products; sales of solar thermal power generation products; sales of solar thermal utilization equipment; manufacturing of new energy prime mover equipment; solar power generation technical services; wind power generation technical services; photovoltaic equipment and component manufacturing