Die block holder

Claim 1

IN A DIE BLOCK HOLDER, THE COMBINATION COMPRISING A BASE BLOCK HAVING A LONGITUDINAL DOVETAIL GROOVE WITH LONGITUDINALLY CONVERGING AND UNDERCUT WALLS, ONE OF SAID WALLS BEING UNDERCUT AT AN ANGLE DIFFERENT FROM THE OTHER OF SAID WALLS, A DIE BLOCK HAVING A DOVETAIL TONGUE FOR EXTENSION INTO SAID GROOVE, SAID TONGUE BEING OF LESSER WIDTH THAN SAID GROOVE AND HAVING EQUALLY TAPERED SIDES FOR OPTIONAL FACE TO FACE CONTACT WITH ONE OF SAID UNDERCUT WALLS OF SAID BASE BLOCK, A KEY HAVING LONGITUDINALLY CONVERGING AND TAPERED SIDES, ONE SIDE OF SAID KEY BEING TAPERED AT AN ANGLE DIFFERENT FROM THE OTHER OF SAID SIDES, SAID TAPERED SIDES ADAPTED FOR WEDGING ENGAGEMENT RESPECTIVELY WITH THE OTHER OF SAID UNDERCUT WALLS OF SAID BASE BLOCK AND ONE OF SAID EQUALLY TAPERED SIDES OF THE TONGUE OF SAID DIE BLOCK, A PLURALITY OF VERTICALLY MOVABLE PINS MOUNTED IN SAID BASE BLOCK ABUTTING THE KEY AT LONGITUDINAL INTERVALS, SAID PINS BEING NORMALLY RESILIENTLY BIASED TOWARD SAID BASE BLOCK, AND MEANS FOR SIMULTANEOUSLY MOVING SAID PINS UPWARDLY AGAINST SAID KEY TO SECURELY LOCK SAID BLOCKS TOGETHER.