| 摘要 |
A platelike element comprises at least one undulated edge portion, which is undulated on opposite sides. At least one pair of undulated connecting members are provided, which are complementary to and mate with said undulated edge portion on opposite sides thereof. Threaded fastening means are connected to said undulated connecting members and to said platelike element adjacent to said undulated edge portion to hold said undulated connecting members mated with said undulated edge portion.
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