173398 ⎘
Prospecting or detecting by methods not provided for in groups - using fields or radiation detectable only by persons susceptible therefor, e.g. radio-esthesis, dowsing
Foreign matter detection device
#2Method and apparatus for sensing spontaneous changes in a localized electromagnetic field and method for use
#3Method and apparatus for in-situ wellbore measurement and control with inductive connectivity
#4Earthquake, ground water, mine, oil, space detection system
#5Indicator rod
#6System and method for monitoring integrity of a wellbore