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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2011 |
| Furnace burners for liquid fuel | $30,312 | $28,192 | | $5,081 | $708,570 | $627 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $114 | | $5,504 | $2,507 | $506,841 | $56,200 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $965 | $70 | $9,868 | $389 | $3,684 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $11,378 | $13,284 | $812 | $6,110 | $24,284 | $17,267 |
| Total | $41,804 | $42,441 | $6,386 | $23,566 | $1,240,084 | $77,778 |
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