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 8288 Crawler Crane Set Parts Inventory and Instructions - LEGO Reference Guide
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LEGO 8288 Crawler Crane Set Parts Inventory and Instructions - LEGO Reference Guide
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LEGO 8288 Crawler Crane Set Parts Inventory and Instructions - LEGO Reference Guide