untility model certificate of the untility model relates to a new floor radiant heat system

utility model certificate of a reverse-flow circular plate gas-gas plate heat exchager 

utility model certificate of a reverse-flow plate frame heat exchanger

utility model certificate of a plate heat exchanger for air conditioning industry

letters patent of plate and frame heat exchanger

letters patent of plate heat exchanger double articulated claws sealing gasket

letters patent of O type compound sealing gasket with U-type protective layer for plate heat exchanger

letters patent of semi welded heat exchanger

letters patent of plate type air preheater

letters patent of plate type heat exchanger plate intelligent production line

letters patent of large closed water cooling circulator

letters patent of multiple combination plate and shell heat exchanger