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3472629 HYDROGEN LEAK DETECTION DEVICE  
3466642 METHOD AND DEVICE FOR AUTOMATIC LEAKAGE DETECTION IN LIQUID-PRESSURE INSULATED POWER CABLES  
3457775 CIRCUITRY FOR LEAK TESTER  
3453151 THERMOCOUPLE WITH LEAK DETECTOR  
3431167 APPARATUS FOR TESTING FOR NUCLEAR FUEL ELEMENT SHEATHING FAILURE  
3427869 FLUID-DETECTING SYSTEM  
3427582 FAILURE INDICATING APPARATUS FOR A SPLIT BRAKE SYSTEM  
3411133 Master cylinder warning device  
3407337 Leak detector for swimming pool lights and the like  
3407123 Electric lamps and method of detecting leaks in such lamps  
3394345 Signal means for indicating residual hydraulic pressure in a brake system  
3392983 Safety control device for use with mechanical seals  
3383863 Pond, tank and pit liner and method of detecting leaks  
3375702 Leak detection method  
3365710 Water loss detector  
3351926 Apparatus and method for detecting leaks in evacuated systems  
3350704 Fuel storage tank installations leak indicator  
3336584 Tell-tale system for jacketed piping systems  
3329933 Safety warning means for hydraulic brake system  
3321956 Flow leak detector  
3314047 Warning devices for motor vehicle brake systems  
3304546 Leak detector for pressurized cable  
3299417 Flexible pressure tubes and conduits  
3273116 Safety system for hydraulic brakes  
3261201 Gasoline leak detector  
3259892 Self-contained cable pressure indicating system  
3252155 Liquid receptacle and method for preparing same  
3236284 Monitoring system for a combustion apparatus and the like  
3228194 Split system indicating means  
3217309 Pneumatically adjustable monitor for pressurized cables  
3200388 Water leakage alarm system  
3192516 Vibration detector  
3187558 Solid state portable gas leak detector  
3184958 Conduit system  
3185894 Means for indicating faults in the crucible of induction melting furnaces  
3176623 Protective system for a diaphragm pump  
3170152 Pipeline leak detection device  
3168824 Audible leak locator  
3166901 Detector for alkali-metal vapors  
3132506 Leak detector for fluid conductors  
3109929 Devices for the automatic monitoring of the variations of a physical magnitude at a multiplicity of distinct points and in particular for detecting can leaks in the channels of a heterogeneous nuclear reactor  
3105442 Diaphragm pump protective system  
3086069 Leakage monitoring means for electric power cables  
3078918 Gas detector for steam condensate and cooling tower water systems  
3041834 Sealing failure sensor  
3033023 Leak detecting apparatus  
3028450 Gas leak detection apparatus  
3016525 Leak annunciator unit  
2990542 Protective device for induction furnaces  
2973042 Multi-engine aircraft feather indicating system