The broken lines in the drawing represent portions of the flare stack burner having spherical valve and environmental subject matter that form no part of the claim.
The broken lines in the drawing represent portions of the flare stack burner having spherical valve and environmental subject matter that form no part of the claim.
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Entry |
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Non-final Office Action from related Design U.S. Appl. No. 29/413,290, mailed Apr. 25, 2012. |
Number | Date | Country | |
---|---|---|---|
Parent | 29413290 | Feb 2012 | US |
Child | 29421989 | US |