Ground-rooting tooth and its mounting

Claim 1

IN A TRAVELLING GROUND-WORKING IMPLEMENT CARRYING A GENERALLY UPRIGHT TOOTH-MOUNTING SHANK HAVING A LOWER PART TAPERING FORWARDLY AND DOWNWARDLY TO A TERMINAL LOWER END THEREOF, A ROOTING TOOTH PROVIDING A REARWARDLYOPENING SOCKET COMPLEMENTARILY RECEIVING SAID TAPERED SHANK PART AND HAVING UPPER AND LOWER EXTERNAL FACES DIVERGING FROM THE WORKING EDGE OF THE TOOTH AT ITS FORWARD END AND CONNECTED BY SIDES HAVING OUTER FACES OF LIKE OUTLINE IN A TOOTH STRUCTURE WHICH IS SYMMETRICAL TRANSVERSELY THEREOF WITH REFERENCE TO A PLANE WHICH PERPENDICULARLY BISECTS SAID WORKING EDGE OF THE TOOTH, A DEFLECTOR PROJECTION OF TRIANGULAR CROSS-SECTION EXTENDING UPWARDLY FROM THE UPPER TOOTH FACE AND REARWARDLY THEREALONG FROM AN INTERMEDIATE POINT OF SAID UPPER FACE AND HAVING ITS FREE EDGE LINE DISPOSED IN SAID PLANE OF SYMMETRY OF THE TOOTH, AND GROUND-SPLITTING FINS OF TRIANGULAR PYRAMID CONFORMATION PROJECTING OUTWARDLY FROM SAID SIDE TOOTH FACES INTERMEDIATELY OF THE EDGES THEREOF AND REARWARDLY THEREALONG FROM CORRESPONDING INTERMEDIATE APEX POINTS IN SAID SIDE FACES AND HAVING THE MUTUALLY DIVERGING OUTER EDGES THEREOF DISPOSED IN A COMMON PLANE PERPENDICULAR TO SAID PLANE OF SYMMETRY OF THE TOOTH, AND A MEANS RELEASABLY FIXING SAID ROOTING TOOTH UPON THE RECEIVED TOOTH-MOUNTING POINT OF THE SHANK.