71516485
Jan 28, 1947
May 11, 1948
WATERPROOFING AND PROTECTIVE COATINGS FOR CONCRETE AND STEEL, NOT IN THE NATURE OF A PAINT, AND MAY BE GENERALLY APPLIED BY OTHER MEANS, THAN BY BRUSH OR SPRAY GUN, SUCH AS A TROWEL; THE MATERIAL OF SUCH COATINGS BEING MADE FROM ASPHALT, ASBESTOS, SOLVENT, RUBBER, PITCH, AND SAND
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