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In linguistics, code-switching occurs when a speaker alternates between two or more languages, or language varieties, in the context of a single conversation.peakers form and establish a pidgin language when two or more speakers who do not speak a common language form an intermediate, third language. On the other hand, speakers practice code-switching when they are each fluent in both languages.
This exchange is installed by the Automatic Electric Company of Chicago for the Bell System. 1920 - First Western Electric Panel switch installed in Omaha, NE. 1921 - On July 30, the first Step-by-Step switch made by Western Electric is installed in Dallas.