CNS 4509-1986 Jacks Telephone (Type JJ-022 JJ-042 JJ-073 JJ-074 JJ-075 JJ-077 and JJ-078)《电话插口（JJ–022，JJ–042，JJ–073，JJ–074，JJ–075，JJ–077，JJ–078型）》.pdf

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