The edge of outer window 120 is considered sharpened since land 124 lies at an angle A relative to {TAIL ~ the axis} 126 of the tube as more particularly described in a co pending patent application directed to {HEAD ~ this particular structure}, assigned to the assignee hereof and incorporated by reference herein 
The edge of outer window 120 is considered sharpened since land 124 lies at an angle A relative to { TAIL ~ the axis } 126 of the tube as more particularly described in a co pending patent application directed to { HEAD ~ this particular structure } , assigned to the assignee hereof and incorporated by reference herein
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