FR504776A - Process and improved apparatus for tunneling tunnels in earth or soft rock, for military or other purposes - Google Patents

Process and improved apparatus for tunneling tunnels in earth or soft rock, for military or other purposes

Info

Publication number
FR504776A
FR504776A FR504776DA FR504776A FR 504776 A FR504776 A FR 504776A FR 504776D A FR504776D A FR 504776DA FR 504776 A FR504776 A FR 504776A
Authority
FR
France
Prior art keywords
military
earth
purposes
improved apparatus
soft 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)
Inventor
Austin Hopkinson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR504776A publication Critical patent/FR504776A/en
Expired legal-status Critical Current

Links

FR504776D 1918-06-10 1918-06-10 Process and improved apparatus for tunneling tunnels in earth or soft rock, for military or other purposes Expired FR504776A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR504776T 1918-06-10

Publications (1)

Publication Number Publication Date
FR504776A true FR504776A (en) 1920-07-16

Family

ID=43352142

Family Applications (1)

Application Number Title Priority Date Filing Date
FR504776D Expired FR504776A (en) 1918-06-10 1918-06-10 Process and improved apparatus for tunneling tunnels in earth or soft rock, for military or other purposes

Country Status (1)

Country Link
FR (1) FR504776A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634113A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Combined drill and expansible breaker mechanism
US2634114A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Cylinder and piston type coal breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634113A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Combined drill and expansible breaker mechanism
US2634114A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Cylinder and piston type coal breaker

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