| 摘要 |
<p>PURPOSE: To provide a bag which is provided with four rolling elements arranged on the same side face and which is transferable by pushing or pulling in accordance with conditions. CONSTITUTION: This bag is constituted so that three rolling elements 34, 36, 38 in four rolling elements 34, 36, 38, 40 rotating on axes nearly parallel to one face 28, rotate around nearly vertical axes against the face 28, and the fourth element 40 has a fixed rotary axis.</p> |
