Passive external noise-canceling dynamic magnetic flux...
Phase shift compensation for metal detection apparatus
Pipe proximity warning device for accidental damage prevention m
Pipeline mapping and interrupter therefor
Pipeline mapping and interrupter therefor
Plural Frequency method and system for identifying metal objects
Plural frequency method and system for identifying metal objects
Plural search frequency directional metal detector apparatus hav
Portable buried object detection system with error reducing sign
Portable metal detection and classification system
Portable transmitter apparatus for inducing alternating current
Portable, buried object detection system with improved signal pr
Position and orientation locator/monitor
Position and orientation locator/monitor
Position and orientation locator/monitor
Position and orientation locator/monitor
Position and orientation locator/monitor
Position and orientation locator/monitor
Positioning, detection and communication system and method
Pre-amplifier and mixer circuitry for a locator antenna