row rectangular concrete blocks place plumbing pipe |
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navigate by keyword : abstract bar block cement concrete corner device dirty distribution drain engineering fitting foundation frame framework framing grey heavy hole industry install job layer laying man material mix mortar new occupation pipe plumbing rough round sand shape show site skill square stack steel strong structure surface system urban waste working |
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The row of square concrete blocks with a round hole in the center, installed in preparation for the sewerage under the ground |
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