Electronic signal generators for generating and coupling electrical current signals to pipes, cables, or other electrically conductive objects; electrical locating and mapping equipment in the nature of signal generators and signal couplers for providing test signals to hidden or buried pipes, cables, or other electrically conductive objects; buried utility locators for receiving magnetic field signals emitted from hidden or buried utilities and determining depth, position, and other information about the hidden or buried utilities based on processing of the received magnetic fields

'base':75 'buri':40,48,60,73 'cabl':13,42 'conduct':17,46 'coupl':7 'coupler':32 'current':9 'depth':64 'determin':63 'electr':8,16,19,45 'electron':1 'emit':56 'equip':23 'field':54,82 'generat':3,5,29 'hidden':38,58,71 'inform':68 'locat':20,50 'magnet':53,81 'map':22 'natur':26 'object':18,47 'pipe':12,41 'posit':65 'process':77 'provid':34 'receiv':52,80 'signal':2,10,28,31,36,55 'test':35 'util':49,61,74

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