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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | | $26,483 | $1,173 | $11,445 | $3,551 | $18,341 | $25,935 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $1,539 | $153,952 | $1,354 | $13,208 | $15,997 | $5,558 | $19,421 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | | | | | | $2,826 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $180,936 | $102,082 | $12,068 | $9,832 | $13,318 | $126,781 | $15,516 |
| Total | $182,475 | $282,517 | $14,595 | $34,485 | $32,866 | $150,680 | $63,698 |
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