List out different types of messages exchanged across a routing socket with brief descriptions.
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Martin Cooper
Motorola was the first company to produce a handheld mobile phone. On April 3, 1973, Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs, his rival.
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Motorala is the first mobile brand
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