For example, it is known that the mandrel can be at an angle with respect to the axis of the plasma beam, and this variation can be implemented in conjunction with {HEAD ~ the principles} of {TAIL ~ present invention} 
of
For example , it is known that the mandrel can be at an angle with respect to the axis of the plasma beam , and this variation can be implemented in conjunction with { HEAD ~ the principles } of { TAIL ~ present invention }
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