You know what? KALLER played a supporting role in developing the first nitrogen springs for use in stamping dies. In the early 1970s, Sigurd Kaller invented something for agricultural plows - a……

(1) variable mold nitrogen spring outside diameter, variable pitch and variable wire diameter (three……

Sometimes when the mold nitrogen spring is filled with good gas, bubbles appear in the bubble measurement at the gap between the dust inside the middle sleeve and the rod, indicating obvious gas leaka……