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পিয়ানোর তার তৈরিতে নিচের কোনটি ব্যবহিত হয়?
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Descrption
<p>Piano wire, or "music wire", is a specialized type of wire made for use in piano strings but also in other applications as springs. It is made from <strong>tempered high-carbon steel</strong>, also known as spring steel, which replaced iron as the material starting in 1834.</p>
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