However, {TAIL ~ the customary cushion} cover sewing method has the drawback that since the edge portions of the upper and lower sheets 12 and gusset 14 are sewn together with the cushion 18 forcefully compressed by {HEAD ~ the physical force} of an operator, the operator is ready to be fatigued 
However , { TAIL ~ the customary cushion } cover sewing method has the drawback that since the edge portions of the upper and lower sheets 12 and gusset 14 are sewn together with the cushion 18 forcefully compressed by { HEAD ~ the physical force } of an operator , the operator is ready to be fatigued
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