专利名称：MARKER TAPE/CABLE
发明人：ARMOND D'ARCY COSMAN,JOE THEODORE MINAROVIC
一转身就是一辈子
申请号：AU7668487
广播收音机申请日：19870807
公开号：AU7668487A
拐杖英文七七情人节公开日：
老手迅雷下载
阳光很暖19880303
英语新学期计划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.
申请人：MINNESOTA MINING AND MANUFACTURING CO.;卤鸡肫
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