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BrickLink - Part BA059pb01 : LEGO Stickered Assembly 6 x 2 x 3 with '8421 Heavy Loader' and Red and White Danger Stripes Pattern (Sticker) - Set 8421 - 3 Brick 2 x 6 [Stickered Assembly] - BrickLink Reference Catalog
BrickLink - Set 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
8421 from BrickLink Studio
BrickLink - Set 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
There is a better really big mobile crane than 42009 - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
BrickLink - Set 8421-1 : LEGO Mobile Crane [Technic:Model:Construction] - BrickLink Reference Catalog
BrickLink - Part 6629pb023 : LEGO Technic, Liftarm, Modified Bent Thick 1 x 9 (6 - 4) with Crane Arm Movement Pattern (Sticker) - Set 8421 [Technic, Liftarm, Decorated] - BrickLink Reference Catalog
Comparing 8053 the 8421 Cranes - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
LEGO MOC 42108 Upgraded Carrier by M_longer | Rebrickable - Build with LEGO