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 Date: 2015-10-13 11:32:11Standards organizations Technology Door Intercom UL American National Standards Institute Science and technology Measurement Draft:6 second break in |
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Date: 2015-10-13 11:32:11Standards organizations Technology Door Intercom UL American National Standards Institute Science and technology Measurement Draft:6 second break in |
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ANSI/DASMAAMERICAN NATIONAL STANDARD PERFORMANCE CRITERIA FOR ACCESSIBLE COMMUNICATIONS