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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $2,146 | $7,062 | $43 | $46 | $337 | $99,879 | $4,490 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $1,303 | $594 | $2,586 | $10,822 | $2,737 | $14,680 | $17,045 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $344 | | $1,511 | | $22,438 | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $14,444 | $4,078 | $4,708 | $2,562 | $53,261 | $256,129 | $81,925 |
| Total | $17,893 | $12,078 | $7,337 | $14,941 | $56,335 | $393,126 | $103,460 |
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