In the late 50's, Pye invented a record player which not only played records but also recorded on blank discs!
Looks like you just changed the headshell and recorded into it using a microphone and you could record onto blank 'magnetic' discs.
Whether you could play these on other players, I don't know.
Has anyone ever seen one of these in action or even heard of them?
Amazing, I never knew these existed.