Transportable buildings of metal; pipes of metal; metal pipes for transporting hydrocarbons; double-jacketed heated metal conduits for transporting hydrocarbons; electrically heated double-jacketed metal conduits for transporting hydrocarbons

[ Transportable metal constructions; metal pipes; metal pipes for the transport of hydrocarbons; heated double-walled metal pipes for the transport of hydrocarbons; electrically heated double-walled metal pipes for the transport of hydrocarbons ]