- The Mobile Crane towers above the construction site as the ultimate construction vehicle
- This huge, detailed set features six-wheel steering, a telescoping boom that extends to twice its original length
- Pneumatic cylinders to raise and lower the boom, four retractable outriggers, motor and battery box
- Includes motor and battery box to extend arm and lower hook
- Measures over 18 inches long when assembled
- Requires 6 "AA" batteries (not included)
移动起重机（Mobile Crane）属于机械组系列积木套组，整个套组包含 1884 个积木颗粒。乐高LEGO 8421 首发于2005年，之后被乐拼LEPIN等国产积木品牌所复刻。
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