| 发明名称 |
MOTOR-POWERED SELF-OPENING AND CLOSING VENTILATORS |
| 摘要 |
Motor-powered ventilators having a domed top or lid which is opened by air pressure therebeneath when the ventilator is operating and which closes when the ventilator is not operating. The ventilators are of completely symmetrical form.
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| 申请公布号 |
US3826183(A) |
申请公布日期 |
1974.07.30 |
| 申请号 |
US19730320102 |
申请日期 |
1973.01.02 |
| 申请人 |
RUDINE K,US |
发明人 |
RUDINE K,US |
| 分类号 |
F04D25/14;(IPC1-7):F04D25/14 |
主分类号 |
F04D25/14 |
| 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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