We had these where I grew up, all the way to the 2010s. They were slow and had limited range but that isn't a problem for milk delivery which is on suburban roa

We had these where I grew up, all the way to the 2010s. They were slow and had limited range but that isn't a problem for milk delivery which is on suburban roads in the middle of the night. However they were surprisingly noisy - I was a mild insomniac and always knew when 2.30AM came round because I could hear the milk float buzzing past outside.