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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $526,867 | $84,493 | $4,056 | $78,598 | | $3,282 | $29,955 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $146,103 | $122,830 | $36,953 | $87,008 | $40,997 | $23,844 | $42,539 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $17,045 | $9,566 | $15,859 | $5,000 | | $14,289 | $4,542 |
| Total | $690,015 | $216,889 | $56,868 | $170,606 | $40,997 | $41,415 | $77,036 |
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