The Mamatwan manganese mine of the Kalahari manganese field

A racquet has elements to link its stringing to the frame within which the stringing is held. Each element is hooked by means of a lug at one end into the frame and at the other end engages a next adjacent element. At the one end the lug is an S-bend linked to a middle portion of the element by a slight reverse bend. At the other end engagement is achieved by an open hook, linked to the middle portion by a bend in the same direction as the reverse bend. The middle portion and hook lie in one plane, whereas the lug lies in another plant substantially perpendicular to the first plane. The elements hold each other firmly in place around the frame and stringing further secures them in place. The mode of stringing disclosed is advantageous in avoiding acute bending of the strings and disposing the stringing in the plane of the holes into which the elements hook. Only one type of element is required, with a slight modification for only the last element to be put into position.