“…Workers in Canada, 7 5 -87 France, 8 8 -89 England,90 Germany, 9 1 -92 Japan, 9 3 and the U.S.94-0 have sponsored work to increase the effectiveness of stem packing. Three manufacturers have worked in this area, Velan Manufacturing Co., 85 ,90 Latty International, France, 8 8 -8 9 and Rockwell International.…”