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Collective letters

ANSI (American National Standards Institute)

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ARIB (Association of Radio Industries and Businesses)

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ATIS (Alliance For Telecommunications Industry Solutions)

Ecma International (Standardizing Information and Communication Systems)

CCSA (The China Communications Standards Association)

ECO (European Communications Office)

CEN(European Committee for Standardization)

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CENELEC (European Committee for Electrotechnical Standardization)

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CESI (China Electronics Standards Institute)

ETSI Work Programme

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European Union