| 摘要 |
PURPOSE:To eliminate the necessity special zig by providing an exhaust tube in a flare tube while providing a supporting wire under the guidance of said exhaust tube. CONSTITUTION:A pair of leads 2a, 2b are provided at the predetermined position of a flare tube 1. Then an exhaust tube 4 is provided on the central axis of said flare tube 1 and a supporting wire 3 is provided through a hollow hole in said exhaust tube 4. Thereafter the small diameter section 1a of said flare tube 1 is heated and softened then pressed to complete a stem. Since special zig ins't required, the facility is simplified. |
