Air stone

Abstract

Description

FIG. 1 is a perspective view of an air stone, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view; and

FIG. 5 is a bottom plan view.

Claims

The ornamental design for an air stone, substantially as shown.