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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Furnace burners for liquid fuel | $12,234 | $7,018 | $4,718 | $12,252 | $69 | $26,861 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $28,208 | $14,136 | $31,022 | $16,202 | $9,545 | $4,463 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $241 | | $1,980 | $8,204 | | $204,730 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $7,139 | $1,134 | $19,403 | $5,515 | $17,381 | $67,609 |
| Total | $47,822 | $22,288 | $57,123 | $42,173 | $26,995 | $303,663 |
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