| 发明名称 |
ROCK DRILL |
| 摘要 |
<p>A fluid operated reciprocating piston rock drill wherein the piston has a stem portion closely slidably received in a guide bushing and the cylinder of the rock drill provides clearance space around the head of the piston.</p> |
| 申请公布号 |
CA1037325(A) |
申请公布日期 |
1978.08.29 |
| 申请号 |
CA19740205035 |
申请日期 |
1974.07.18 |
| 申请人 |
JOY MANUFACTURING COMPANY |
发明人 |
BAILEY, EDWARD A.;FISH, WALTER D. |
| 分类号 |
B25D9/12;B25D9/14;E21B1/30;E21B1/38;(IPC1-7):25D9/02 |
主分类号 |
B25D9/12 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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