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| Commodity | 2006 | 2007 | 2008 |
| Roller chain of iron/steel | $273,002 | $2,123,445 | $374,882 |
| Articulated link chain other than roller chain, of iron/steel | $1,585,375 | $1,118,047 | $805,582 |
| Parts of articulated link chain of iron/steel | $92,078 | $236,635 | $1,355,368 |
| Skid chain of iron/steel | $88,578 | $391,452 | $77,662 |
| Stud-link chain of iron/steel | $87,954 | $104,786 | $47,711 |
| Welded link chain of iron/steel | $442,336 | $585,604 | $207,341 |
| Chain, of iron/steel, n.e.s. in 73.15 | $918,470 | $684,902 | $753,988 |
| Parts of chains (excl. articulated link chain), of iron/steel | $311,055 | $405,034 | $1,155,559 |
| Total | $3,798,848 | $5,649,905 | $4,778,093 |
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