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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 |
| Furnace burners for liquid fuel | $1,823 | $8,535 | $21,582 | $51,810 | $17,890 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $411,135 | $10,190 | $487,223 | $793,815 | $121,967 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $669 | $29,328 | $683 | $5,343 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $56,098 | $35,563 | $399,098 | $260,474 | $124,213 |
| Total | $469,056 | $54,957 | $937,231 | $1,106,782 | $269,413 |
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