for planing edges or ridges or cutting grooves (cutting helical grooves B23D5/02)

Full Title

Planing or slotting machines cutting by relative movement of the tool and workpiece in a horizontal straight line only > with tool-supports or work-supports specially mounted or guided for working in different directions or at different angles; Special purpose machines > for planing edges or ridges or cutting grooves (cutting helical grooves B23D5/02)