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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $1,693 | $2,953 | $4,651 | $3,474 | $501 | $1,500 | $19,616 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $230,000 | $480 | $2,819 | $15,886 | $29,148 | $151,811 | $2,697 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | | | $2,800 | | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | | $4,316 | $3,041 | $9,052 | $15,257 | $3,077 | $220 |
| Total | $231,693 | $7,749 | $10,511 | $31,212 | $44,906 | $156,388 | $22,533 |
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