| 摘要 |
<p>A combined long/short dumb-bell made up of four components. The two pieces (A, D) can be used as a short dumb-bell, while a long dumb-bell is produced by assembling all four pieces. The components are cylindrical, with tapering conical mortices (2) or tenons (4) provided with screw threads (1, 3, 7, 8) at both their narrow and wide points.</p> |
