FR621274A - Hollow steel drill bit improvements for rock drills - Google Patents

Hollow steel drill bit improvements for rock drills

Info

Publication number
FR621274A
FR621274A FR621274DA FR621274A FR 621274 A FR621274 A FR 621274A FR 621274D A FR621274D A FR 621274DA FR 621274 A FR621274 A FR 621274A
Authority
FR
France
Prior art keywords
drill bit
hollow steel
rock drills
steel drill
drills
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.)
Expired
Application number
Other languages
French (fr)
Inventor
Leslie Pryce
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 filed Critical
Application granted granted Critical
Publication of FR621274A publication Critical patent/FR621274A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
FR621274D 1926-09-11 1926-09-11 Hollow steel drill bit improvements for rock drills Expired FR621274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR621274T 1926-09-11

Publications (1)

Publication Number Publication Date
FR621274A true FR621274A (en) 1927-05-09

Family

ID=8985000

Family Applications (1)

Application Number Title Priority Date Filing Date
FR621274D Expired FR621274A (en) 1926-09-11 1926-09-11 Hollow steel drill bit improvements for rock drills

Country Status (1)

Country Link
FR (1) FR621274A (en)

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