LEGO 8421 Mobile Crane Set Parts Inventory and Instructions - LEGO Reference Guide
Pictorial Review: 8421 Mobile Crane - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
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LEGO 8421 Mobile Crane Technic Series - 2005 Vintage - New & Sealed | eBay
File:LEGO Technic 8421.jpg - Wikimedia Commons
BrickLink - Set 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
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