With the prior art mattress 10, an operator manually engages the edge portions of the upper and lower sheets 12 and gusset 14 by compressing a cushion 18 by the elbow and sews together the engaged edge portions and {HEAD ~ the automatically supplied cloth tape} 16 by {TAIL ~ a sewing machine} 
With the prior art mattress 10 , an operator manually engages the edge portions of the upper and lower sheets 12 and gusset 14 by compressing a cushion 18 by the elbow and sews together the engaged edge portions and { HEAD ~ the automatically supplied cloth tape } 16 by { TAIL ~ a sewing machine }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL