4. Motors: expansible chamber type
  5. Cyclically operable
  6. Motive fluid constantly applied to one working member face

Kenneth Weddfelt

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Control device

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Impulse generator and method for impulse generation

Motors: expansible chamber type – Cyclically operable – Motive fluid constantly applied to one working member face
Reexamination Certificate

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Method and device

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2310324

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