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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
B28D1/32—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
B28D1/325—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist for making holes in easily splittable working materials
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FR329002D1903-02-021903-02-02
Device for drilling and marking slate plates
ExpiredFR329002A
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