IC 020. US 002 013 022 025 032 050. G & S: PLASTIC VALVES-NAMELY, BALL VALVES (TRUE UNION), PNEUMATICALLY ACTUATED BALL VALVES, GATE VALVES, BUTTERFLY VALVES, GLOBE VALVES, [ DIAPHRAM ] * DIAPHRAGM * VALVES AND HORIZONTAL SWING CHECK VALVES. FIRST USE: 19721201. FIRST USE IN COMMERCE: 19721201
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