Preferably, a short timing period device is incorporated electrically intermediate the time clock and the pump to permit {TAIL ~ control} of each dosage cycle to a matter of a predetermined number of {HEAD ~ seconds} even if the time clock is incapable of such fine control 
Preferably , a short timing period device is incorporated electrically intermediate the time clock and the pump to permit { TAIL ~ control } of each dosage cycle to a matter of a predetermined number of { HEAD ~ seconds } even if the time clock is incapable of such fine control
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