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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $2,520,172 | $1,686,744 | $1,451,483 | $2,226,486 | $2,694,502 | $5,040,175 | $1,947,634 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $2,152,181 | $3,199,722 | $3,464,298 | $3,819,938 | $1,656,780 | $1,720,439 | $1,293,527 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $50,316 | $300,983 | $225,376 | $802,423 | $702,293 | $309,091 | $934,226 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $5,640,788 | $6,439,662 | $6,063,681 | $8,291,262 | $4,514,529 | $3,848,246 | $6,611,135 |
| Total | $10,363,457 | $11,627,111 | $11,204,838 | $15,140,109 | $9,568,104 | $10,917,951 | $10,786,522 |
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