| http://www.w3.org/ns/prov#value | - After a delay, which may be, for example, from about 0.020 to about 0.080 second, such as about 0.050 second, in duration, the states of valves 18 and 13 a are switched for a period of time, which may be, for example, from about 0.1 to about 0.5 second, such as about 0.25 second.
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