| 摘要 |
580,292. Rivets. UNIVERSAL ASBESTOS MANUFACTURING CO., Ltd., and PENDRIGH, T. G. June 26, 1944, No. 12122. [Class 89 (i)] [Also in Group XXII] Rivets, for use in connecting together sheets of asbestos cement or for connecting such sheets to angle or other bars, are made from bars of asbestos cement before the material has fully set. The sheets are formed with countersunk holes and the rivets A are moulded in situ. |
