Carbide-tipped percussion drill bit, in particular for down-the-hole hammer drills
DE3408225A1
Percussion drill bit
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DRILL BIT FOR HITTING ROCK DRILLING MACHINES
DE2601302A1
Percussive rock drill bit - has four cutters along arms of angled cross offset from bit centre and fifth cutter pointed to cross intercept
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Drill crown for percusive stone drilling equipment - has five equally spaced hard metal cutting edges projecting from circumferential front surface of drill crown head
DE2510298A1
Drill bit for stone drilling machine - has on the front face surface hardened grooves between hard metal cutting inserts
DE2510265A1
Drilling bit for masonry drilling machine - has central conical convex cutting surface with hard metal inserts
