blue string established the use plumb bob plummet used vertical reference line for wall construction |
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| navigate by keyword : block bob building cement concrete construct construction dirty down ensure establish field grungy house identify indicate indicator install line make mark measure nail plumb plumbbob plummet reference rope set straight string sure technique the thread tool use using vertical wall weight |
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| A blue string, established by the use of a plumb bob or plummet, used as a vertical reference line for wall in construction. |
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