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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $23,893 | $10,848 | $6,922 | $4,206 | $6,811 | $11,133 | $7,443 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $14,357 | $2,543 | $2,622 | $2,605 | $2,797 | $373 | $67,231 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $8,280 | $91 | | $22,874 | $1,185 | $1,863 | $1,315 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $981 | $5,908 | $328 | $7,998 | $735 | $4,965 | $892 |
| Total | $47,511 | $19,390 | $9,872 | $37,683 | $11,528 | $18,334 | $76,881 |
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