| 摘要 |
<p>The toy construction set has several discs with a common thickness which is between one-sixth and one third of the basic diameter. The discs have central holes with a common diameter of similar dimensions to the thickness. Elongated links are symmetrical longitudinally and transversely and have a common width equal to the basic disc size, and a common thickness also equal to the basic disc thickness. Threaded coupling bolts have an outer diameter fitting into the central holes, and have a length about three times as long as the disc thickness. (First major country equivalent to PT--76189).</p> |
