Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings ; Features of such surfaces not otherwise provided for, their treatment being unspecified
Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings ; Features of such surfaces not otherwise provided for, their treatment being unspecified