Topic on Talk:Telephone Exchange Names
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Wikipedia is contradicting itself if it's turning TIdewater into TW. The counterexample from the same article is "MUrray Hill 5-9975 is another example of the 2L-5N format, one of the Ricardos' numbers on I Love Lucy. The H in Hill, although not dialed, is still capitalized as the first letter of the second word."
So MU5-9975 and not MH5-9975. Same comment on MUrray Hill as MU is confirmed by and .