The tolerances which can be routinely maintained in sand casting normally do not require any machining when {HEAD ~ the teachings} of {TAIL ~ this invention} are used 
of
The tolerances which can be routinely maintained in sand casting normally do not require any machining when { HEAD ~ the teachings } of { TAIL ~ this invention } are used
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH