Portable roof guard rail support device
作者： Mark W. Reichel
DOI:
关键词:
摘要: A portable roof guard rail support device adapted for fastening directly to a pitched and adjustment the pitch of protecting workers from falling off comprises attachment plate attaching roof, beam pivotally connected plate, an angle brace removably rotatably varying at which is plurality cross bar channels through removable bars, channel within storing transportation.
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