Pneumatic tube
FIG. 1 is a side elevational view of a pneumatic tube showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is an end elevational view thereof; 
     FIG. 4 is a bottom plan view thereof; and 
     FIG. 5 is a fragmentary enlarged end elevational view taken along lines 5--5 of FIG. 1.