| 发明名称 |
First down indicator system |
| 摘要 |
A first down indicator system adapted for removable attachment to a first down marker post of markers of the type used in football games for marking a distance of ten yards to determine first down measurement.
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| 申请公布号 |
US8220170(B1) |
申请公布日期 |
2012.07.17 |
| 申请号 |
US20100855761 |
申请日期 |
2010.08.13 |
| 申请人 |
WINCKLER KENNETH H.;GREENE JASON C. |
发明人 |
WINCKLER KENNETH H.;GREENE JASON C. |
| 分类号 |
A63B71/06;G01B11/26;G01C15/00 |
主分类号 |
A63B71/06 |
| 代理机构 |
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代理人 |
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