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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $11,819 | $24,536 | $30,695 | $27,577 | $75,715 | $33,980 | $13,000 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $43,889 | $54,465 | $46,099 | $460,307 | $55,783 | $97,415 | $138,000 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,969 | $24,540 | $9,968 | $3,651 | $19,531 | $179,851 | $80,000 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $6,593 | $44,674 | $34,271 | $138,831 | $142,237 | $45,737 | $101,000 |
| Total | $64,270 | $148,215 | $121,033 | $630,366 | $293,266 | $356,983 | $332,000 |
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