The best results are obtained with the PP 60 hydraulic pruning-scissors compared with those obtained with the K 12 chain saw and the hand-saw. The criteria compared relate to the output expressed in man/hour, to the pruned height, to the number of injuries, to the quality of the cut and the maintenance of tools. Of course, the efficiency of the PP 60 (9.30 trees/man/hour) is higher than that of a hand-saw (6.08 trees/man/hour) but is similar to that of the K 12 though the quality of work with the PP 60 is much better than that with the K 12 and the PP 60 hardly requires any maintenance whereas the K 12 does. The whole criteria taken into consideration clearly show the superiority of the PP 60 compared with the K 12. Its advantages (speed, user friendliness, law maintenance, high cutting quality) outnumber its disadvantages (climbing tools needed, removal of the hydraulic facilities, limited cutting ability).
323.2 (Entasten) 323.13 (Mit Hilfe sonstiger Maschinen (z.B. stehend Roden)) 305 (Arbeitsablauf und Leistung. Lohnberechnung auf der Grundlage von Leistungsmessungen (Zeit- und Leistungstafeln, Arbeitsbewertung)) 176.1 (Dicotyledoneae [Siehe Anhang D])
