教学手段有哪些kuk专利名称：MARKER TAPE/CABLE
发明人：ARMOND D'ARCY COSMAN,JOE THEODORE MINAROVIC小学生英语
拆散的意思申请号：AU7668487
申请日：19870807
公开号：AU7668487A
十分钟看懂中国
公开日：
因人而异 英语19880303
itoa专利内容由知识产权出版社提供
摘要：A marking tape (10) that is positioned underground above utility lines wherein the marking tape carries a pair of cloly spaced, parallel, insulated conductors (12, 14) that extend the length of the tape and at least one other insulated conductor (32 or 34) extending the length of the tape which is parated from the pair of conductors (12, 14) at a distance that is greater than the distance between the conductors of the pair of conductors. Passive markers (47) having a resonant circuit can be lectively placed along the tape (10) wherein the resonant circuit (48, 50) is electromagnetically coupled to the pair of conductors (12, 14) and the other conductor (32 or 34). The other insulated conductor can be one of a pair of conductors similar to the other pair of conductors. A method is disclod whereby the making tape can be electromagnetically traced with the position of the passive markers established. A method is also disclod for determining the distance to a break in the tape which caus the pair of conductors to be vered.
urgent申请人：MINNESOTA MINING AND MANUFACTURING CO.;
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