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The Loop (Games)
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| LEGO → System → Technic → Accessories |
1321 Worm Gears and Gear Racks is a Technic Accessories set released in 1987. It includes 12 OldGray 1 x 4 Technic gear racks (Part 3743) and 10 OldGray Technic worm srews (Part 4716).
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