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| Commodity | 2005 | 2006 | 2007 | 2008 |
| Roller chain of iron/steel | $30,526 | $1,414 | $1,630 | $4,156 |
| Articulated link chain other than roller chain, of iron/steel | $196,597 | $56,474 | $138,617 | $428,234 |
| Parts of articulated link chain of iron/steel | $1,540 | $5,821 | $1,211 | $3,271 |
| Skid chain of iron/steel | | $772 | $215 | $503 |
| Welded link chain of iron/steel | $120 | $122 | $511 | $14,804 |
| Chain, of iron/steel, n.e.s. in 73.15 | $112,840 | $108,217 | $31,184 | $11,962 |
| Parts of chains (excl. articulated link chain), of iron/steel | $4,662 | $322 | | |
| Total | $346,285 | $173,142 | $173,368 | $462,930 |
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