72204570
Oct 22, 1964
Nov 30, 1965
PROPPING AGENTS-NAMELY, SAND, ALUMINUM PELLETS, WALNUT SHELLS, AND GLASS BEADS COATED WITH A RADIOACTIVE MATERIAL NAMELY, ZIRCONIUM-NIOBIUM, COBALT, IRIDIUM, AND IRON, USED PRINCIPALLY IN THE OIL AND GAS WELL SERVICING INDUSTRY IN FRACTURING SUBSURFACE EARTH FORMATIONS TRAVERSED BY A WELL BORE
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