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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $14,886 | $6,650 | $12,802 | $161,522 | $31,635 | $137,234 | $37,748 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $2,609 | $16,471 | $47,079 | $13,821 | $242,958 | | $8,321 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $8,217 | | | | $352 | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $48,237 | $128,751 | $38,479 | $105,341 | $21,573 | $32,585 | $46,314 |
| Total | $73,949 | $151,872 | $98,360 | $280,684 | $296,518 | $169,819 | $92,383 |
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