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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Furnace burners for liquid fuel | $11,558 | $82,956 | $34,036 | $12,046 | $52,996 | $14,245 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $5,584 | $9,766 | $83,695 | $22,581 | $13,215 | $187,502 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $173 | | | $11,220 | $12 | $65 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $193,472 | $105,512 | $53,151 | $212,305 | $81,054 | $235,481 |
| Total | $210,787 | $198,234 | $170,882 | $258,152 | $147,277 | $437,293 |
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