| 发明名称 |
DUST-PROOFING DEVICE IN ROLLER HEARTH TYPE HEAT TREATMENT FURNACE, COMPRISING CLEAN AIR DUCTS ADHERED ONTO OUTER SURFACES OF SIDEWALLS OF A FURNACE BODY, AIR BLOWHOLES FORMED IN THE CLEAN AIR DUCTS, AND A SKIRT FORMED ON THE CLEAN AIR DUCTS TO LATERALLY COVER THE AIR BLOWHOLES |
