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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $667,521 | $1,145,597 | $734,361 | $1,243,012 | $192,395 | $51,848 | $19,499 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $928,596 | $1,062,458 | $1,337,037 | $421,455 | $100,280 | $129,644 | $56,166 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $6,628 | $1,051 | $2,227 | $1,254 | $2,454 | $2,734 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $6,373,906 | $9,753,038 | $12,482,069 | $14,490,710 | $13,392,564 | $17,115,021 | $22,201,157 |
| Total | $7,970,023 | $11,967,721 | $14,554,518 | $16,157,404 | $13,686,493 | $17,298,967 | $22,279,556 |
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