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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $734 | $88 | | $601 | $5,361 | $3,579 | $4,288 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $5,964 | $1,438 | $4,584 | $22,463 | $4,066 | $25,497 | $296 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $333 | $251 | | | | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $14,210 | $24,331 | $80,128 | $27,447 | $39,741 | $30,481 | $47,982 |
| Total | $21,241 | $26,108 | $84,712 | $50,511 | $49,168 | $59,557 | $52,566 |
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