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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | | | $710,150 | $58,470 | $55,433 | $53,018 | $82,880 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $3,258,736 | $2,609,144 | $3,341,812 | $3,109,112 | $1,426,457 | $732,329 | $609,558 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | | | | $532,453 | $471,336 | $556,647 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $2,209,780 | $3,414,745 | $4,853,206 | $8,512,893 | $5,829,604 | $7,786,761 | $4,837,047 |
| Total | $5,468,516 | $6,023,889 | $8,905,168 | $11,680,475 | $7,843,947 | $9,043,444 | $6,086,132 |
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