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ETSI ETR 261-3
M00000958
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ETSI ETR 261-3 Human Factors (HF); Assessment and definition of a harmonized minimum man-machine interface (MMI) for accessing and controlling public network based supplementary services; Part 3: Experimental comparison of two MMIs - Simulated UPT access and prototype ISDN supplementary services
standard by European Telecommunications Standards Institute, 10/01/1996
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