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In 1886, Jackson of San Francisco applied for a patent in which prestress was introduced by ___________

In 1886, Jackson of San Francisco applied for a patent in which prestress was introduced by ___________ Correct Answer Tensioning the reinforced rods in sleeves

In present state of development in the field of prestressed concrete is due to continuous research done by engineers and scientists in this field during the last 90 years while Jackson of San Francisco applied for a patent “construction of artificial stone and concrete pavements”, in which prestress was introduced by tensioning the reinforced rods set in sleeves.

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