It's a hydraulic crane with bucket attachment for fixing telephone lines or pruning trees
... a 
hydraulic crane, esp one mounted on a lorry, that has an elbow joint or telescopic 
arm... [DOC] [TLE] Cherry picker | Define Cherry picker at Dictionary.com [PAR] a moveable boom, having a bucketlike attachment at its top that is large enough 
to carry a worker: used for repairing telephone lines, pruning trees, etc.