Subclass 1/14: Dovetailed work; Tenons; Making tongues or grooves (slotting B27F 5/00); Groove-and-tongue jointed work; Finger-joints (machines or devices for working mitred joints B27G 5/00; cutting tools for cutting grooves or tenons B27G 13/14) Making dovetails, tongues, or tenons, of definite limited length Corner-locking machines, i.e. machines for cutting crenellated joints Arrangements of gauging means specially designed for corner-locking machines (measuring instruments G01)