Tannoy has become generic for any public address systems.
Apparently "The company's intellectual property department keeps a close eye on the media and will often write to publications that use its trade name without a capital letter or as a generic term for PA systems, in order to preserve its trademark."
I heard a reference to 'the Tannoy' in a recently made film that had a yesteryear setting, and it sounded wrong (a goof like the plastic water bottle on the mantlepiece in Downton Abbey) but when I looked it up, it turned out the company was founded in the 1920s and had trademarked Tannoy by 1932 - so the reference was appropriate.
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