| 摘要 |
PROBLEM TO BE SOLVED: To adjust a ledger for complying with two kinds of dimension of prefabricated scaffolding applicable for a meter size and an inch size. SOLUTION: By means of this length adjusting structure, a projecting length of a clamping metal fitting protruded in a connection end part of the ledger can be adjusted, and consequently, the ledger can be used for either of two kinds of prefabricated scaffolding.
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