| 摘要 |
A frame for a moulded elastic material such as elastomer foam 7. It comprises a layer having a series of surfaces A, B, C arranged in a chequered network in which the black and white squares are surfaces A, B contained in separate planes; the edges of the surfaces corresponding to squares having a common side being connected by oblique surfaces C, the corners of the surfaces corresponding to squares having a common corner being separated. <IMAGE>
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