Lingual tube

FIG. 1 is a top front perspective view of a lingual tube according to the claimed design;

FIG. 2 is a bottom back perspective view of the lingual tube of FIG. 1 ;

FIG. 3 is a front elevation view of the lingual tube of FIG. 1 ;

FIG. 4 is a back elevation view of the lingual tube of FIG. 1 ;

FIG. 5 is a right side elevation view of the lingual tube of FIG. 1 , the left side being identical thereto;

FIG. 6 is a top plan view of the lingual tube of FIG. 1 ; and,

FIG. 7 is a bottom plan view of the lingual tube of FIG. 1 .

The broken lines in the figures are for the purposes of illustrating portions of the lingual tube or environmental structure that form no part of the claimed design.