The embodiment shown in FIG 4 is characterized by the application to the exterior of {HEAD ~ the tube} 12 of a silver or other oligodynamically active metal in a powdery form ranging in {TAIL ~ particle size} between 200 and 300 mesh 
The embodiment shown in FIG 4 is characterized by the application to the exterior of { HEAD ~ the tube } 12 of a silver or other oligodynamically active metal in a powdery form ranging in { TAIL ~ particle size } between 200 and 300 mesh
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH