| 摘要 |
A segment key that is made of two punched, with same shape and rigidly connected to each other segments, at that each of those has rounded and flat sections, at that the segments are rigidly connected to each other with a link that is arranged as one part with those, this is placed between them in the places where rounded sections go to flat ones, at that thickness of the link is equal to 3.14 of thickness of separate segments, and the flat sections of those belong to one plane. |
