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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $839,347 | $1,053,137 | $685,368 | $963,319 | $726,045 | $590,688 | $441,887 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $601,379 | $530,602 | $436,498 | $1,167,215 | $1,147,846 | $487,670 | $306,848 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $12,894 | $9,932 | $24,977 | $181,875 | $96,985 | $129,670 | $49,606 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $516,582 | $151,419 | $342,865 | $787,363 | $281,336 | $423,173 | $528,689 |
| Total | $1,970,202 | $1,745,090 | $1,489,708 | $3,099,772 | $2,252,212 | $1,631,201 | $1,327,030 |
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