Irradiation from only one side would call for continuous rotation of the bellows during the irradiation for uniform exposure and is, therefore, not preferred even though this, too, would result in {HEAD ~ a uniform modification} of {TAIL ~ the hardness} of the second wall region 2 
Irradiation from only one side would call for continuous rotation of the bellows during the irradiation for uniform exposure and is , therefore , not preferred even though this , too , would result in { HEAD ~ a uniform modification } of { TAIL ~ the hardness } of the second wall region 2
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