| 摘要 |
2131464 9317605 PCTABS00025 Two tetrahedrons (10, 20) are fixed together at a common joint (17) and provided with a seat (18) fixed between faces (11, 21) of respective tetrahedrons and parallel to a support plane formed by two joints (16, 26) meeting the common joint (17) at the common joint. For equilateral tetrahedrons which meet at an angle of 109· 30' between faces, plural seating can be provided by fixing three or more tetrahedrons together in a variety of configurations having a common support plane and seats (18, 28) parallel thereto.
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