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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $15,976 | $6,997 | $11,707 | $87,379 | $51,966 | $29,347 | $3,870 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | | | $1,170 | | $164,926 | $58,794 | $295,502 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $4,461 | | | | | $102 | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $60,086 | $18,673 | $818 | $3,054,479 | $809,928 | $3,797 | $8,106 |
| Total | $80,523 | $25,670 | $13,695 | $3,141,858 | $1,026,820 | $92,040 | $307,478 |
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