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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $20,351 | $24,392 | $18,712 | $4,550 | $18,797 | $9,406 | $10,490 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $24,128 | $19,056 | $12,598 | $16,612 | $24,818 | $14,857 | $54,895 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $988 | $291 | $6,958 | $21,255 | $3,537 | $12,472 | $15,334 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $26,130 | $81,446 | $150,249 | $134,633 | $120,609 | $1,022,218 | $126,264 |
| Total | $71,597 | $125,185 | $188,517 | $177,050 | $167,761 | $1,058,953 | $206,983 |
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