FR2001904A1 - - Google Patents

Info

Publication number
FR2001904A1
FR2001904A1 FR6903684A FR6903684A FR2001904A1 FR 2001904 A1 FR2001904 A1 FR 2001904A1 FR 6903684 A FR6903684 A FR 6903684A FR 6903684 A FR6903684 A FR 6903684A FR 2001904 A1 FR2001904 A1 FR 2001904A1
Authority
FR
France
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR6903684A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Mine Service Co
Original Assignee
National Mine Service Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Mine Service Co filed Critical National Mine Service Co
Publication of FR2001904A1 publication Critical patent/FR2001904A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C27/00—Machines which completely free the mineral from the seam
    • E21C27/20—Mineral freed by means not involving slitting
    • E21C27/22—Mineral freed by means not involving slitting by rotary drills with breaking-down means, e.g. wedge-shaped drills, i.e. the rotary axis of the tool carrier being substantially perpendicular to the working face, e.g. MARIETTA-type

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
FR6903684A 1968-02-14 1969-02-14 Withdrawn FR2001904A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70552268A 1968-02-14 1968-02-14

Publications (1)

Publication Number Publication Date
FR2001904A1 true FR2001904A1 (fr) 1969-10-03

Family

ID=24833852

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6903684A Withdrawn FR2001904A1 (fr) 1968-02-14 1969-02-14

Country Status (1)

Country Link
FR (1) FR2001904A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000113A1 (fr) * 1984-06-12 1986-01-03 Wirth Maschinen-Und Bohrgeräte-Fabrik Gmbh Procede et dispositif pour modifier la section d'une galerie, d'un tunnel ou analogue

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000113A1 (fr) * 1984-06-12 1986-01-03 Wirth Maschinen-Und Bohrgeräte-Fabrik Gmbh Procede et dispositif pour modifier la section d'une galerie, d'un tunnel ou analogue
US4696600A (en) * 1984-06-12 1987-09-29 Wirth Maschinen- Und Bohrgerate-Fabrik Gmbh Method and apparatus for modifying the cross-sectional profile of an adit, tunnel or the like

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Legal Events

Date Code Title Description
ST Notification of lapse