Changes made since version 3 : + lattice boom structure like on crawler cranes + string (yes, string) + Ackermann-like steering + stronger superstructure Inspirations to this model: Supercar Picture of a crawler crane Picture of a crawler crane Crawler crane Lego Technic 846...By: xobile001
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Source: http://www.instructables.com/id/KNEX-Mobile-Crane-v-4/
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