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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $202,000 | $128,000 | $260,000 | $512,000 | $389,000 | $433,000 | $195,000 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $4,974,000 | $4,295,000 | $5,123,000 | $4,502,000 | $1,366,000 | $1,602,000 | $1,708,000 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $5,000 | $104,000 | $4,000 | $24,000 | $294,000 | $47,000 | $10,000 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $1,983,000 | $1,408,000 | $1,561,000 | $1,750,000 | $1,845,000 | $1,325,000 | $1,424,000 |
| Total | $7,164,000 | $5,935,000 | $6,948,000 | $6,788,000 | $3,894,000 | $3,407,000 | $3,337,000 |
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