| 摘要 |
<p>The sliding block consists of three blocks (41, 42, 43) of which the outmost ones (41, 43) move in sychronism, while the middle one (42) can be brought in two different positions with respect to the upper block (43), in order to determine first a cavity (46) the height of which corresponds to that of a first molding (56), and is then increased in order to perform a second molding (58) superposed onto the first one and extending into the parts (44, 45) of the mold. Figure 1</p> |
