Just after {HEAD ~ the point} where {TAIL ~ the first bypass vacuum line} 110 branches from the processing line 84, a second bypass line 112, having air valve 75 and hand valve 73, is connected to the processing line 84 on either side of an air valve 74 
Just after { HEAD ~ the point } where { TAIL ~ the first bypass vacuum line } 110 branches from the processing line 84 , a second bypass line 112 , having air valve 75 and hand valve 73 , is connected to the processing line 84 on either side of an air valve 74
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