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Blow molded dynamite tube

Image Number 3 for United States Patent #4433625.

A molded plastic dynamite tube with an air ventillation hole is defined by a recess within the lower portion of the tube. The vent hole is formed by air pressure inside the tube during the molding process. The plastic blown out of the recess to define the vent hole and to form an extent co-planar with the side wall of the tube.

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