Which TV show was the first to use a "cold open?"

'A cold open (also called a teaser) in a television program or movie is the technique of jumping directly into a story at the beginning or opening of the show, before the title sequence or opening credits are shown. ... Cold opens have been popular on television since the 1950s.'

https://en.wikipedia.org/wiki/Cold_open

The earliest named show I have found so far is the Avengers from 1961, mentioned at the above link.