Abstract: An engraving and marking device, usable in machine tools and the like, includes a supporting member provided with a coupling which is engaged by a spindle of a machine tool and supports a toolbit by means of an elastic support. The device is adapted to engrave and mark a piece being machined in a fully automatic manner.
Abstract: An engraving dial formed of an upper dial plate, a lower dial plate, a bottom holder plate and a top holder plate for use in an inside ring engraving machine form is disclosed in which the upper dial plate and the lower dial plate are detachably and reversibly secured between the top and bottom holder plates, each dial plate having the top and bottom sides respectively engraved with a set of signs of a different form for selection.