DE208432C - - Google Patents

Info

Publication number
DE208432C
DE208432C DENDAT208432D DE208432DA DE208432C DE 208432 C DE208432 C DE 208432C DE NDAT208432 D DENDAT208432 D DE NDAT208432D DE 208432D A DE208432D A DE 208432DA DE 208432 C DE208432 C DE 208432C
Authority
DE
Germany
Prior art keywords
gaps
drill
pipe
drill according
openings
Prior art date
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.)
Active
Application number
DENDAT208432D
Other languages
German (de)
English (en)
Publication of DE208432C publication Critical patent/DE208432C/de
Active legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/02—Core bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
DENDAT208432D Active DE208432C (ja)

Publications (1)

Publication Number Publication Date
DE208432C true DE208432C (ja)

Family

ID=470467

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT208432D Active DE208432C (ja)

Country Status (1)

Country Link
DE (1) DE208432C (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467209A (en) * 1965-07-19 1969-09-16 Dibotec Ag Self-drilling anchor with enlarged bore zone
US7227879B2 (en) 2003-06-27 2007-06-05 Nichia Corporation Nitride semiconductor laser device having current blocking layer and method of manufacturing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467209A (en) * 1965-07-19 1969-09-16 Dibotec Ag Self-drilling anchor with enlarged bore zone
US7227879B2 (en) 2003-06-27 2007-06-05 Nichia Corporation Nitride semiconductor laser device having current blocking layer and method of manufacturing the same
US7817692B2 (en) 2003-06-27 2010-10-19 Nichia Corporation Nitride semiconductor laser device having current blocking layer and method of manufacturing the same

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