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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $10,624,028 | $4,419,372 | $273,658 | $1,743,568 | $3,234,015 | $4,638,678 | $3,721,023 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $39,998 | $13,588 | $898,263 | $3,023,928 | $662,557 | $441,248 | $1,081,175 |
| Total | $10,664,026 | $4,432,960 | $1,171,921 | $4,767,496 | $3,896,572 | $5,079,926 | $4,802,198 |
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