... Canvas,Membrane. Antiflash NL-5557,CE Stationary High Frequency Welder For Tarpaulins, Tents, Billboards, Signs, Truck CoversThe ... Series of High Frequency welding machine for Tarpaulins,Tents,Billboards, Signs,Truck Covers,Canvas,Membrane ... quality imported apparatus,the longest welding extended to 1800mm one time.European-model squarness high frequency vibration bos ...