| 摘要 |
<p>854,133. Joint-making packing. M.L. AVIATION CO. Ltd. March 26, 1959 [Jan. 1, 1958], No. 83/58. Class 122 (3). [Also in Group XXVIII] A hard steel sealing washer 6, for use in a pipe joint, is formed on each of its opposite sides with one or more relatively narrow annular ridges 7 adapted to bite into opposed sealing surfaces of the joint.</p> |
