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Featured below are US Patent classes related to communications. Included in this listing are subclasses from Class 340, 370, 375, 379, and 455. Patents in class 340 are related to a variety of inventions related to electrical communications. Patents in class 370 are more specific to multiplex communications. Class 455 is related to telecommunications, and 379 is specific to telephonic communications. You will find a list of some of the more interesting classes below.