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Use of relays in proposed submarine cable system where some relays will be used to adjust Ocean Block Equalizers while cable is laid and, thereafter, will remain set for life of cable; other relays, controlled from shore, will be operated only if it should become necessary to adjust Shore Controlled Equalizers to compensate for changes in transmission characteristics of cable; description of relay samples featuring high sensitivity, hermetically sealed contact chamber, bifurcated fixed contact springs for higher contact reliability, and spring supported armature to avoid friction inherent in conventional bearings; test results of resistance variations with operation and of frequency response vs initial contact resistance.