| http://www.w3.org/ns/prov#value | - Controls Product Brief | September 14, 2014 Optimal Engineering Systems: Pick & hold modules for solenoid control electronics The compact (3.00 in x 3.00 in x .85 in) PH-ET Pick & Hold module from Optimal Engineering Systems, a very low-cost solution for solenoid control electronics, is a reliable module suitable for driving valves, relays, actuators, DC motors including voice coil and moving magn
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