My own old fleet of Stihl saws, all still fire up, all dated approx 1978 , lot of Dutch elm disease in Great Britain in 70s , these 070s popped em over and 020s took canopy of trees out , 3 ply rope ,harness ,with no leg loops no chippers no stump grinders .. But no tree could not be done ,I worked for Coventry city council ,great days days before tree work got like the surfing scene .., nearly 60 now but can still safely clamber up and keep up with the young blades