Switching units and trunking for electronic automatic exchange

WHEN AUTOMATIC Electric Laboratories undertook the development of the Electronic Automatic Exchange (E-A-X), the end product of the development, the switching system and its hardware, was planned to be manufacturable and economical under present conditions. The factors of reliability, maintainability, compatibility, practicability, and availability, coupled with their economic aspects, determined the course of the development and removed it from the experimental realm.
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