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3385102 Rapid cycle leak detection of plural test pieces  
3364729 Leak detection system and method for cold liquid storage tanks  
3363451 Gas leak detector having leak concentration responsive indicating means  
3361547 Detection of gas leaks  
3355587 Gas analysis apparatus comprising plural ionization chambers with different ionizing electron beam energy levels in the chambers  
3351926 Apparatus and method for detecting leaks in evacuated systems  
3342990 Leak detection system which utilizes a sorption pump and a specific mass spectrometer detector  
3329008 Leak detector probe with integral flow indicator  
3324729 Method and apparatus for detecting leaks  
3323350 Leak detector  
3310734 Leak detection apparatus including a movable pressure sensitive gauge for evacuated chambers  
3280619 Leak detection  
3281521 Electrical apparatus insulated with a mixture of insulating gases  
3273379 Method of locating leaks  
3260786 Housing arrangement for electrical apparatus in submarine cable installations  
3248297 Methos of operating gas cooled nuclear reactors  
3247706 Leak testing of nuclear reactor fuel elements  
3246505 Leak detection method and apparatus  
3234045 Method for protecting underground cable and determining leaks therein  
3232640 Multi-wall flexible connector with interply pressurization  
3214963 Detection of a failure in a container  
3204449 Testing of cigarette filters  
3187558 Solid state portable gas leak detector  
3186214 Leak test station  
3174329 Method for testing ordnance seals  
3166843 Method of curing cheese in an inspection type container  
3159998 Vacuum gage and leak detector  
3159021 Process for detection of leaks in industrial vacuum plants  
3107517 Natural gas leak detection  
3106089 Method and apparatus for locating leaks  
3091114 Method and apparatus for testing sealed packages for leaks  
3090112 Method of determining leaks in lightning arresters and the like  
3087327 Method and device for locating leaks in a heat exchanger  
3086069 Leakage monitoring means for electric power cables  
3085423 Leak detection  
3085198 Combination leak detector and vacuum gauge  
3077104 Process for detecting the interface between two adjacent fluids  
3070992 Pressure gauge and method of operation  
3060725 Method of locating leaks in buried pipelines  
3036457 Leak detector  
3034338 Testing seals  
3032655 Method of detecting pipe line leaks  
3029628 Leak detector  
3027754 Leak detecting method and composition for fuel systems  
3027753 Leak detection device  
3026715 Leak detector test table  
3025606 Leak locator method and apparatus  
3020746 Thermal conductivity leak detector  
3009243 Method of filling submersible pump motor chambers  
3003349 Warning system