Lego 8837 Pneumatic Excavator. Year: 1992. Really awesome to build this one! Got it fully working while missing one part. Used a long tube instead of 2 short ones (missing the long connector) - 9GAG
TC20] 8837 Pneumatic Excavator (Studless version) - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Original Box 8837-1 : Pneumatic Excavator [(unsorted)] [BrickLink]