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| Commodity | 2005 | 2006 |
| Roller chain of iron/steel | $557,733 | $1,214,269 |
| Articulated link chain other than roller chain, of iron/steel | $732,434 | $793,015 |
| Parts of articulated link chain of iron/steel | $130,737 | $577,444 |
| Skid chain of iron/steel | $1,040 | $6,227 |
| Stud-link chain of iron/steel | $83,094 | $135,151 |
| Welded link chain of iron/steel | $283,665 | $74,683 |
| Chain, of iron/steel, n.e.s. in 73.15 | $211,946 | $231,656 |
| Parts of chains (excl. articulated link chain), of iron/steel | $157,001 | $191,488 |
| Total | $2,157,650 | $3,223,933 |
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