71533502
Aug 29, 1947
Jul 12, 1949
PUTTY, ASPHALT AND COAL TAR COMPOSITIONS FOR ROOFING, REPAIRING ROOFS, WATER-PROOFING AND PROTECTIVELY COATING WALLS AND OTHER STRUCTURES OF MASONRY AND CONCRETE, AND PROTECTING PIPE, WALLS AND OTHER STRUCTURES AGAINST MOISTURE AND CORROSIVE AGENTS
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