发明授权
US5495915A Collapsible ladder 失效
可折叠的梯子

Collapsible ladder
摘要:
A collapsible ladder comprises telescopically collapsible sections, and latch mechanisms in each of the rungs for automatically locking the sections relative to one another when the sections are extended. The latch mechanisms are arranged to release the sections when a rung is collaped against the next lower rung.
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