71569451
Nov 26, 1948
Oct 10, 1950
RAYMOND AND RUTH PERELMAN EDUCATION FOUNDATION
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LIGHT WEIGHT SILICEOUS POWDERED AND GRANULAR MATERIALS-NAMELY, EXPANDED PERLITE FOR USE AS A FILLER, FILTER AID, INSULATING MATERIAL, AND AS AN INGREDIENT IN PLASTER, CONCRETE, AND INSULATING BOARD