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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Furnace burners for liquid fuel | $92,527 | $12,685 | $226,430 | $20,494 | $17,054 | $186,159 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $258,770 | $5,574 | $83,984 | $139,081 | $1,144,551 | $418,256 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $66,558 | $38,659 | $2,101 | $3,349 | $1,858 | $1,919 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $65,575 | $14,151 | $104,758 | $246,277 | $91,025 | $53,131 |
| Total | $483,430 | $71,069 | $417,273 | $409,201 | $1,254,488 | $659,465 |
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