专利名称：Ultrasonic pest repeller 发明人：Patrick F. Malleolo
申请号：US07/408280
印象最深的老师申请日：19890918
杜仲的作用与功效公开号：US04999818A
公开日：
19910312
灿烂的反义词
专利内容由知识产权出版社提供
国内高校排名>不用谢英语怎么说
生命教育的感悟摘要：A relatively simple but highly effective circuit for producing ultrasonic signals which are utilized to repel pests and vermin. The frequency of the signals is sufficiently high to be undetected by humans and most domestic animals and pets.面部暗沉
学习插画
申请人：MALLEOLO; PATRICK F.
代理人：G. Donald Weber, Jr.
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