NL229339A - - Google Patents

Info

Publication number: NL229339A
Authority: NL; Netherlands

Application number

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.)

1957-07-04

Publication of NL229339A publication Critical patent/NL229339A/xx

Classifications

- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
- E21D17/02—Cantilever extension or similar protecting devices
- E21D17/08—Cap joints for obtaining a coal-face free of pit-props
- E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

Landscapes

Engineering & Computer Science (AREA)
Mining & Mineral Resources (AREA)
Life Sciences & Earth Sciences (AREA)
General Life Sciences & Earth Sciences (AREA)
Geochemistry & Mineralogy (AREA)
Geology (AREA)
Conveying And Assembling Of Building Elements In Situ (AREA)

NL229339D 1957-07-04 NL229339A (xx)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB2112157A GB891140A (en)	1957-07-04	1957-07-04	Improvements in or relating to mine roof supporting bars

Publications (1)

Publication Number	Publication Date
NL229339A true NL229339A (xx)

Family

ID=10157548

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL229339D NL229339A (xx)	1957-07-04

Country Status (4)

Country	Link
BE (1)	BE569133A (xx)
FR (1)	FR1207659A (xx)
GB (1)	GB891140A (xx)
NL (1)	NL229339A (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1289805B (de) *	1962-01-29	1969-02-27	Groetschel Karl Maria	Mechanisch rueckbare Strebausbaueinheit

0
- NL NL229339D patent/NL229339A/xx unknown
- BE BE569133D patent/BE569133A/xx unknown
1957
- 1957-07-04 GB GB2112157A patent/GB891140A/en not_active Expired
1958
- 1958-07-03 FR FR1207659D patent/FR1207659A/fr not_active Expired

Also Published As

Publication number	Publication date
GB891140A (en)	1962-03-14
BE569133A (xx)
FR1207659A (fr)	1960-02-18

Publication	Publication Date	Title
IT601133A (xx)
DE1072510B (xx)
DE1048646C2 (xx)	1959-07-09
FR1194365A (xx)	1959-11-09
IT566879A (xx)
BE564404A (xx)
BE569596A (xx)
BE557963A (xx)	1957-11-30
BE566098A (xx)
BE560349A (xx)
BE560469A (xx)
BE561600A (xx)
BE561672A (xx)
BE562803A (xx)
BE574128A (xx)
BE573475A (xx)
BE563044A (xx)
BE573185A (xx)
BE563333A (xx)
BE563490A (xx)	1958-01-15
BE572684A (xx)
BE572632A (xx)
BE566602A (xx)
BE569133A (xx)
BE565191A (xx)	1958-08-26