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  2. Cement board - Wikipedia

    en.wikipedia.org/wiki/Cement_board

    Cement board is composed of aggregated Portland cement with a glass-fiber mesh on the surfaces. This 5 ⁄ 16 inch (7.9 mm) thick cement board is designed as an underlayment for tile floors.

  3. Plaster - Wikipedia

    en.wikipedia.org/wiki/Plaster

    Plaster was first used as a building material and for decoration in the Middle East at least 7,000 years ago. In Egypt, gypsum was burned in open fires, crushed into powder, and mixed with water to create plaster, used as a mortar between the blocks of pyramids and to provide a smooth wall facing.

  4. Isolation cabinet (guitar) - Wikipedia

    en.wikipedia.org/wiki/Isolation_cabinet_(guitar)

    A guitar speaker isolation cabinet is a sound-proof enclosure that surrounds the speaker and sound-capturing microphone and prevents sound leakage into the outside environment, enabling the guitar amplifier to be turned up without excessive listening volume.