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１９９４年已授权电通信技术专利题录１跳频跟踪式接收机：ＣＮ２１５９６３１Ｙ［专］中国矿业大学；ＩＰＣ：Ｈ０４Ｂ１／１６Ｎ．１２２多功能有线对讲机：ＣＮ２１５８６００Ｙ［专］／董祝元；ｌＰＣ：Ｈ０４Ｂ１／３８（可广泛用于各种矿山斜井、竖井、采矿．仓库内...
1994 has authorized the title of patent of electric communication technology 1 Frequency hopping tracking receiver: CN2159631Y [Special] China University of Mining and Technology; IPC: H04B1 / 16N. 122 Multi-function Wired Walkie-talkie: CN2158600Y [Special] / Dong Zhu yuan; lPC: H04B1 / 38 (can be widely used in a variety of mine shaft, shaft, mining ...