13 DIAPHRAGM MOTOR VALVES, BACK PRESSURE VALVES, PRESSURE REDUCING REGULATORS AND ROTARY PILOT VALVES
FIRST USE AT LEAST AS EARLY AS 1960 ON DIAPHRAGM MOTOR VALVES; IN COMMERCE AT LEAST AS EARLY AS 1960. FIRST USE AT LEAST AS EARLY AS 1960 ON DIAPHRAGM MOTOR VALVES; IN COMMERCE AT LEAST AS EARLY AS 1960.