CN201747291U - 煤矿井下松软煤层用钻杆 - Google Patents
煤矿井下松软煤层用钻杆 Download PDFInfo
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- CN201747291U CN201747291U CN2010202527064U CN201020252706U CN201747291U CN 201747291 U CN201747291 U CN 201747291U CN 2010202527064 U CN2010202527064 U CN 2010202527064U CN 201020252706 U CN201020252706 U CN 201020252706U CN 201747291 U CN201747291 U CN 201747291U
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- drill rod
- coal
- drilling rod
- coal mine
- spiral groove
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CN2010202527064U CN201747291U (zh) | 2010-07-09 | 2010-07-09 | 煤矿井下松软煤层用钻杆 |
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CN2010202527064U CN201747291U (zh) | 2010-07-09 | 2010-07-09 | 煤矿井下松软煤层用钻杆 |
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CN201747291U true CN201747291U (zh) | 2011-02-16 |
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CN2010202527064U Expired - Lifetime CN201747291U (zh) | 2010-07-09 | 2010-07-09 | 煤矿井下松软煤层用钻杆 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108442891A (zh) * | 2018-05-21 | 2018-08-24 | 河南理工大学 | 一种非对称截面螺旋刻槽钻杆 |
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2010
- 2010-07-09 CN CN2010202527064U patent/CN201747291U/zh not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108442891A (zh) * | 2018-05-21 | 2018-08-24 | 河南理工大学 | 一种非对称截面螺旋刻槽钻杆 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C56 | Change in the name or address of the patentee |
Owner name: PINGDINGSHAN GUANHONG MINE TECHNOLOGY EQUIPMENT CO Free format text: FORMER NAME: PINGDINGSHAN GONGHONG INDUSTRY AND TRADE CO., LTD. |
|
CP01 | Change in the name or title of a patent holder |
Address after: Pingdingshan City, Henan province 467000 Ping Tong Lu, Zhanhe district north of West 800 meters Patentee after: PINGDINGSHAN GUAN HONG MINING TECHNOLOGY AND EQUIPMENT LIMITED COMPANY Address before: Pingdingshan City, Henan province 467000 Ping Tong Lu, Zhanhe district north of West 800 meters Patentee before: Pingdingshan Gonghong Industry and Trade Co., Ltd. |
|
CX01 | Expiry of patent term |
Granted publication date: 20110216 |
|
CX01 | Expiry of patent term |