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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $2,735 | $39,378 | | $78 | $298 | $30,505 | |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $25,324 | $28,989 | $87,899 | $242,869 | $148,409 | $135,728 | $223,461 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $390 | $5,850 | | $415 | $60,775 | $62,174 | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $6,280 | $9,359 | $65,198 | $12,370 | $60,845 | $48,860 | $1,005 |
| Total | $34,729 | $83,576 | $153,097 | $255,732 | $270,327 | $277,267 | $224,466 |
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