Safety codes. Safety codes for prevention of dust explosions, National Fire Protection Association and Department of Agriculture, sponsors; tentative American standard, approved July 2, 1926, by American Engineering Standards Committee.
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Safety codes. Safety codes for prevention of dust explosions, National Fire Protection Association and Department of Agriculture, sponsors; tentative American standard, approved July 2, 1926, by American Engineering Standards Committee.
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Safety codes. Safety codes for prevention of dust explosions, National Fire Protection Association and Department of Agriculture, sponsors; tentative American standard, approved July 2, 1926, by American Engineering Standards Committee.