H04N 21/4221
{Dedicated function buttons, e.g. for the control of an EPG, subtitles, aspect ratio, picture-in-picture or teletext}
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Edits on 5 Mar, 2022
Golden AI
Edits made to:
Infobox (+4 properties)
Description (+117 characters)
H04N 21/4221
{Dedicated function buttons, e.g. for the control of an EPG, subtitles, aspect ratio, picture-in-picture or teletext}
Infobox
Classification Type
Parent classification
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