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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $835,000 | $497,000 | $663,000 | $686,000 | $2,030,000 | $385,000 | $744,000 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $5,972,000 | $2,890,000 | $7,070,000 | $1,279,000 | $3,951,000 | $3,475,000 | $2,826,000 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $40,000 | $24,000 | $2,000 | $117,000 | $1,000 | $15,000 | $31,000 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $2,001,000 | $1,153,000 | $2,599,000 | $1,644,000 | $2,085,000 | $3,740,000 | $2,455,000 |
| Total | $8,848,000 | $4,564,000 | $10,334,000 | $3,726,000 | $8,067,000 | $7,615,000 | $6,056,000 |
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