71186247
Sep 26, 1923
Feb 3, 1925
ACID-PROOF AND FIREPROOF CEMENT OR LUTE FOR PROTECTING JOINTS AND LOCATIONS EXPOSED TO ACIDS OR ACID FUMES UNDER HOT OR COLD CONDITIONS OR INTENSE HEAT, AND FOR USE AS A MORTAR FOR BRICK OR OTHER WORK SUBJECT TO CONTACT WITH ACIDS OR ACID FUMES UNDER HOT OR COLD CONDITIONS
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