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mbarrick
When I went to the horology museum at the Greenwich Observatory in 2020 they had old telephones from different decades where you could listen to recordings of the different voices British Telecom used over the years.
source: https://mbarrick.tumblr.com/post/675226097390092288
Source: https://www.mbarrick.com/blog/220204/when-i-went-horology-museum-greenwich-observatory
