| 发明名称 |
BALLISTIC SHAPE SCREWHEAD SOCKET |
| 摘要 |
Square socket-type head for screw fasteners, and punch for forming same, in which the socket has four equal sides each of which has an upper slightly inwardly inclined flat portion which merges without discontinuity at its lower end with a lower concave bottom portion.
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| 申请公布号 |
US3640175(A) |
申请公布日期 |
1972.02.08 |
| 申请号 |
USD3640175 |
申请日期 |
1968.10.18 |
| 申请人 |
STEEL CO. OF CANADA LTD. THE |
发明人 |
ALLAN SANGSTER BARCLAY |
| 分类号 |
F16B23/00;(IPC1-7):F16B23/00 |
主分类号 |
F16B23/00 |
| 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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