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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $8,110 | $7,839 | $1,489 | $18,043 | $11,059 | $12,409 | $5,952 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $34,100 | $10,359 | $14,899 | $4,600 | $8,739 | $17,415 | $79,986 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,300 | $397 | $8,062 | $426 | $743 | $8,302 | $51,767 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $2,190 | $58,345 | $120,840 | $88,607 | $85,469 | $80,698 | $24,892 |
| Total | $45,700 | $76,940 | $145,290 | $111,676 | $106,010 | $118,824 | $162,597 |
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