| http://www.w3.org/ns/prov#value | - Referring more particularly to Figure l, the numeral 10 indicates an actuating device, such as a solenoid, rotary cam or the like, to provide an alternating drive for operating a control device or periodic pressure generator, in the form of a diaphragm pump as shown in the drav ing, which in` turn serves to control or operate the main pumping device in the form of a squeeze or expansion pump, thro
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