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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $19,289 | $162,549 | $107,880 | $63,057 | $115,565 | $34,320 | $117,980 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $237,158 | $94,422 | $158,986 | $310,523 | $160,449 | $129,594 | $138,370 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,800 | $5,661 | $222 | $181 | $252 | | $1,666 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $61,185 | $47,415 | $83,435 | $232,217 | $276,812 | $166,459 | $106,704 |
| Total | $319,432 | $310,047 | $350,523 | $605,978 | $553,078 | $330,373 | $364,720 |
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