there are no true 20th century directories (eg Kelly's or Post Office as found for many UK cities) - the manx museum has some trade listings (generally paid for advertising) - enquiries@mnh.gov.im (but they are closed for the next 10 days tho the email service might be operational) - you could try old telephone directories.
Manx Genealogy Archive 2 is maintained by isleofman.com
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