Utility locators for detecting magnetic field signals emitted by utilities, namely, electromagnetic apparatus used to measure electromagnetic fields from hidden or buried utility pipes, conduits, cables, or other conductors; Signal induction devices for inducing current onto utilities using magnetic fields comprising of signal generators and magnetic field antennas; portable battery powered dipole magnetic field generators; devices for inductively coupling data signals onto utilities, namely, inductive couplers for magnetically coupling electrical current signals to hidden or buried utility pipes, conduits, cables, or other conductors
Electrical and Scientific Apparatus