| 专利名称 | Secure entry system with acoustically coupled telephone interface | ||
| 申请号 | US07806801 | 申请日 | |
| 公开（公告）号 | US5245652A | 公开（公告）日 | |
| 申请（专利权）人 | SUPRA PROD INC | 发明人 | LARSON WAYNE F; HENDERSON WALTER G |
| 专利来源 | 国家知识产权局 | 转化方式 | |
| 摘要 |
A comprehensive real estate lockbox system is disclosed which provides a variety of operational features. One of these includes a reader key that can retrieve access data from a system lockbox. The reader key is provided with an audible tone generator which can be selectively enabled by the user. The tone generator can be used to download data from the reader key over telephone lines. |
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主管部门：海南中小企业服务 | 建设单位：海南商业联合会
版权所有：海南商业联合会 | 备案号：粤ICP备13083911号（ICP加挂服务）@2017
