| 摘要 |
(Designate Figure 4b) A lockable telephone plug apparatus comprises a shank member for insertion into a line jack unit said shank member having suitable connections for connecting with the electrical connections in the line jack unit. The shank member has a movable locking member mounted thereon and arranged to be in use moved by a locking means to engage a part of the line jack unit socket to prevent removal of the telephone plug apparatus from the line jack unit. The shank member and the locking means are mounted in a housing.
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