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There are various competing claims in the history of TV. Baird certainly achieved silhouettes before he sent pictures with light and shade.
The "World's First TV Service" from Alexandra Palace, London started on 2nd November 1936. This needs to be carefully qualified to make it a true statement.
1: Add "High definition". This excludes the various sub 100 line services that existed before then.
2: Add "Regular". The BBC service had a published schedule.
3: Add "Public". Anyone wth the money could buy a receiver.
It can be argued that the German 180 line service predates the BBC 405 line service. However it was only just about regular and it certainly wasn't public. Sets were only in communal viewing rooms and the homes of a few senior nazis. You can argue as to whether 180 lines was HD by the standards of the time. It's marginal.
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