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| drill head | |||
| boring head; boring bar | |||
| bit; cutting head; drill bit; drill crown; gaite; gate; jack bit; jackbit; swivel head | |||
| bore bit | |||
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| cutterhead tunnel boring | |||
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| drilling heads parts of machines | |||
| Bohrkopf: 3 phrases in 3 subjects |
| Drilling | 1 |
| Life sciences | 1 |
| Mechanic engineering | 1 |