| 摘要 |
1,157,217. Blow pipe burners. HARRIS CALORIFIC CO. 13 Feb., 1967 [14 Feb., 1966], No. 6757/67. Heading F4T. An oxy-acetylene torch has two manually operated valves for controlling the flow of oxygen and fuel gas and a pair of on-off valves E, F controlled by a lever H which on further depression opens a cutting oxygen valve G and which can be locked in any of the open or shut positions by a toggle I. |
