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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $3,173,951 | $1,366,760 | $2,462,237 | $1,452,331 | $321,538 | $820,485 | $893,733 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $2,301,496 | $3,041,180 | $1,768,487 | $515,663 | $141,121 | $239,712 | $45,982 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $4,950 | | $6,046 | $21,305 | $13,003 | $7,177 | $26,717 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $10,973,557 | $10,182,067 | $10,608,346 | $8,214,375 | $8,613,057 | $10,110,030 | $7,794,800 |
| Total | $16,453,954 | $14,590,007 | $14,845,116 | $10,203,674 | $9,088,719 | $11,177,404 | $8,761,232 |
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