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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Furnace burners for liquid fuel | $1,406 | $555 | | $18,500 | $20,676 | $2,394 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $6,797 | $4,238 | $5,013 | $105,212 | $23,256 | $30,628 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $2,623 | $5,868 | $464 | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $11 | $2,975 | $241 | $5,517 | $5,112 | $17,307 |
| Total | $8,214 | $10,391 | $11,122 | $129,693 | $49,044 | $50,329 |
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