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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | | $6,026 | $10,740 | $14,203 | $64,605 | $1,089 | $3,738 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $2,781 | $15,265 | $29,889 | $1,479 | $9,778 | $722 | $46,804 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $20,142 | $7,134 | | | $1,226 | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | | $76 | $8,257 | $450 | $1,732 | $46 | $1,324 |
| Total | $22,923 | $28,501 | $48,886 | $16,132 | $77,341 | $1,857 | $51,866 |
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