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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $1,544 | $3,183 | $58,059 | $25,810 | | $7,483 | |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $36,849 | $13,805 | $6,926 | $16,336 | $68,971 | $132,996 | $8,017 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $529 | $577 | | | $30 | $2,179 | $6,386 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $3,975 | $5,081 | $6,599 | | $19,497 | $21,340 | $7,097 |
| Total | $42,897 | $22,646 | $71,584 | $42,146 | $88,498 | $163,998 | $21,500 |
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