Mahala, Milan K.; Ray, Jyotiranjan S.; Kanungo, Alok Kumar; Bhuvan, G. N. S. Sree; Chatterjee, A.; George, B. G.; Sorcar, N.; Rawat, Y. S.; Kharakwal, J. S.; Rajesh, S. V.
(Research Square Company, 2025-06)
Advancements in stone bead technology, particularly in drilling techniques, emerged during the Indus Valley (Harappan) civilization. Long-constricted cylindrical drill bits, made from a unique stone called Ernestite, were ...