the a key telephone system developed in the bell system in the s. [ ] key systems can be built using three principal architectures: electromechanical shared-control, electronic shared-control, or independent key sets. new installations of key telephone systems have become less common, as hybrid systems...
the a key telephone system developed in the bell system in the s. [ ] key systems can be built using three principal architectures: electromechanical shared-control, electronic shared-control, or independent key sets. new installations of key telephone systems have become less common, as hybrid systems...
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