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B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
Procede facilitant l'introduction d'une tige de percage dans un trou de coulee d'un four a cuve et pince speciale pour la mise en oeuvre de ce procede