| CPC E01C 9/08 (2013.01) [E01C 5/005 (2013.01); E01C 5/20 (2013.01); E01C 5/22 (2013.01); E01C 2201/12 (2013.01)] |

| AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT: |
| The patentability of claims 13-15 is confirmed. |
| Claims 1-12 and 16-22 are cancelled. |
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13. A constructional panel as claimed in claim 12, wherein the lock member rotatable between free and locked positions, the tab being insertable into and and removable from the receptor when the lock member is in its free position and the tab when located in the receptor being held therein on turning the rotable member to its locked position.
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