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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $72,878 | $23,367 | $89,011 | $133,939 | $28,522 | $205,133 | $229,807 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $50,100 | $86,145 | $55,487 | $28,473 | $166,999 | $87,651 | $56,375 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $27,836 | $19,493 | $51,291 | $130,376 | $46,387 | $65,788 | $158,334 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $88,715 | $108,496 | $152,801 | $116,022 | $134,041 | $76,286 | $200,578 |
| Total | $239,529 | $237,501 | $348,590 | $408,810 | $375,949 | $434,858 | $645,094 |
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