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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $43,601 | $7,771 | $12,018 | $37,995 | $3,226 | $23,760 | $8,244 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $60,656 | $48,012 | $75,157 | $110,875 | $63,919 | $91,542 | $65,914 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $14,161 | $66,552 | $6,528 | $11,118 | $1,540 | $12,663 | $8,417 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $7,116 | $9,286 | $153,307 | $156,684 | $82,662 | $27,789 | $57,889 |
| Total | $125,534 | $131,621 | $247,010 | $316,672 | $151,347 | $155,754 | $140,464 |
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