Mini crawler crane designed I came up with (cat for scale) I used set 42121 as the base and the instructions for set 8288. The hardest part was setting up the pulley
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LEGO TECHNIC: Crawler Crane (8288) for sale online | eBay
Brickshelf: Pics of 8288 Crawler Crane - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Sold at Auction: LEGO TECHNIC 8288 CRAWLER CRANE ASSEMBLED W/ BOX