| 摘要 |
The present invention provides a half panel having on its back ribs defining symmetrically complimentary closed wall open faced cells and ribs having spaces there between. The half panel may be placed in back to back relationship and rotated through a required degree of rotation so that the open faced closed wall cells and ribs having spaces there between interlock so the open faced closed wall cells have at least one diagonal cross member. This provides a rigid panel suitable for a number of applications including forms for pouring concrete.
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