A forced cooling apparatus for a heat treatment apparatus comprising a heat treatment furnace having a process tube with one end open at an furnace opening and another end closed at an furnace top portion; and a heater portion which covers the process tube, and wherein cooling of the heat treatment furnace...http://www.google.com.tw/patents/US5360336?utm_source=gb-gplus-share專利 US5360336 - Forced cooling apparatus for heat treatment apparatus
