Another object of {HEAD ~ this invention} is to provide a reel device, as aforesaid, having {TAIL ~ a tubing reel} which selectably pays out or retracts gas tubing in a manner which minimizes or even precludes tangling or pinching of the tubing 
Another object of { HEAD ~ this invention } is to provide a reel device , as aforesaid , having { TAIL ~ a tubing reel } which selectably pays out or retracts gas tubing in a manner which minimizes or even precludes tangling or pinching of the tubing
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