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Happy birthday to Radio 4 pips

5 February 2014 Last updated at 09:50 GMT

The radio 'time pips', still heard on outlets such as BBC Radio 4 and BBC World Service radio, are 90 years old.

To celebrate, BBC Radio 4's Today programme played a special happy birthday version of the pips, and spoke to former BBC announcer Charles Lister.

First broadcast on BBC Radio 4's Today programme on Wednesday 5 February 2014.