4. Mining or in situ disintegration of hard material
  5. Automatic control; signaling or indicating

Leo Häkkinen

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Arrangement in rock drilling apparatus

Boring or penetrating the earth – With magazine for successively moving unconnected – oriented...
Reexamination Certificate

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Method and arrangement for determining position of unmanned...

Mining or in situ disintegration of hard material – Automatic control; signaling or indicating
Reexamination Certificate

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