| 摘要 |
468,115. Rivets. DORTMUNDER UNION BRUCKENBAU AKT.-GES. Nov. 3, 1936, No. 29876. Convention date, Dec. 7, 1935. [Class 89 (i)] [Also in Group XXII] The shank of a rivet B, Fig. 3, is tapered over its whole length, or at the upper end b<1>, Fig. 4 only, or at the tail end b<3>, Fig. 5. A groove b4 may be formed adjacent the head b2. |
