steel plummet plum bob for vertical line control position wall pillar building construction |
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| navigate by keyword : accuracy adjust appliance architecture balance bob building site checking civil engineering cone construction control corrosion equipment exact examination gravity hang industrial industry inspection instrument level line manually mason masonry measure measurement metal perpendicular plumb plummet precision rope rust rusted rusty sinker steel straight string thin thinly tool twine vertical plum lineacent anot aiexcl position wall pillar hanging measuring constructions |
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| Vertical rusty metal plumb, plummet or plum bob, at building site is hanging on a thin rope, instrument for measuring in masonry and constructions |
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