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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | | $3,959 | $34,769 | $4,367 | $28,220 | $660 | $69,352 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $7,381 | $240,843 | $33,647 | $24,013 | $26,965 | $165,699 | $87,205 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $15,539 | | $23,285 | $93,690 | $43,350 | $40,020 | $125,993 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $27,372 | $60,069 | $78,082 | $70,594 | $102,472 | $69,506 | $147,505 |
| Total | $50,292 | $304,871 | $169,783 | $192,664 | $201,007 | $275,885 | $430,055 |
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