| 发明名称 |
Digital subtractor |
| 摘要 |
|
| 申请公布号 |
US2956748(A) |
申请公布日期 |
1960.10.18 |
| 申请号 |
US19560602764 |
申请日期 |
1956.08.08 |
| 申请人 |
BELL & HOWELL COMPANY |
发明人 |
WEISSMAN RICHARD M. |
| 分类号 |
G06F7/498;G06F7/50 |
主分类号 |
G06F7/498 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
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