FR492187A - Improvements in rock drills - Google Patents

Improvements in rock drills

Info

Publication number
FR492187A
FR492187A FR492187DA FR492187A FR 492187 A FR492187 A FR 492187A FR 492187D A FR492187D A FR 492187DA FR 492187 A FR492187 A FR 492187A
Authority
FR
France
Prior art keywords
rock drills
drills
rock
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)
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 FR492187A publication Critical patent/FR492187A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • E21D9/106—Making by using boring or cutting machines with percussive tools, e.g. pick-hammers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
FR492187D 1916-08-28 1916-08-28 Improvements in rock drills Expired FR492187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR492187T 1916-08-28

Publications (1)

Publication Number Publication Date
FR492187A true FR492187A (en) 1919-07-01

Family

ID=1528099

Family Applications (1)

Application Number Title Priority Date Filing Date
FR492187D Expired FR492187A (en) 1916-08-28 1916-08-28 Improvements in rock drills

Country Status (1)

Country Link
FR (1) FR492187A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2307122A1 (en) * 1975-04-08 1976-11-05 United Kingdom Government HYDRAULIC PERCUSSION DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2307122A1 (en) * 1975-04-08 1976-11-05 United Kingdom Government HYDRAULIC PERCUSSION DEVICE

Similar Documents

Publication Publication Date Title
FR492187A (en) Improvements in rock drills
FR465082A (en) Improvements in explosives
FR471749A (en) Improvements in locks
FR454606A (en) Improvements in the spurs
FR482174A (en) Improvements in mechanical seed drills
FR481848A (en) Improvements in awls
FR482982A (en) Improvements in seed drills
FR480949A (en) Improvements in gyroscopes
FR479077A (en) Improvements in concrete constructions
FR431434A (en) Improvements in hydraulic planers
FR459295A (en) Hydraulic drill for drilling rocks and other materials
FR503896A (en) Improvements in explosives
FR502334A (en) Improvements in explosives
FR462162A (en) Improvements in hydro-airplanes
FR478677A (en) Improvements in rock drilling machines
FR488804A (en) Improvements in underwater mines
FR467465A (en) Improvements in airplanes
FR485054A (en) Improvements in glazing
FR457422A (en) Improvements in collars
FR482380A (en) Improvements in portholes
FR518388A (en) Improvements in mineral concentration
FR494362A (en) Improvements in explosives
FR488090A (en) Improvements in explosives
FR494363A (en) Improvements in explosives
FR459541A (en) Improvements in explosives