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hollow brick (Heavier bricks are poor insulators of sound while light weight and hollow bricks provide good sound insulation.  slideshare.net zal); burnt clay hollow brick (slideshare.net zal) | |||
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| hollow brick (Heavier bricks are poor insulators of sound while light weight and hollow bricks provide good sound insulation. slideshare.net zal); burnt clay hollow brick (slideshare.net zal) | |||