首页>
外国专利>
Geothermal probe for heating purpose, has pipe with profile provided on its inner and outer sides and helical curves, where helical curves are respectively provided as cylindrical spirals
Geothermal probe for heating purpose, has pipe with profile provided on its inner and outer sides and helical curves, where helical curves are respectively provided as cylindrical spirals
The probe has a pipe with a profile provided on its inner and outer sides and helical curves, where the helical curves are respectively provided as cylindrical spirals.
展开▼