tv hifi spotting

[Sherwood]

I was watching a programme the other day on the Nuremberg war trials. I was intrigued by the arrangement that the prosecutor setup for simultaneous translation through headphones. Initially, I thought the headphones looked a lot like Grado designs, until I realised that the company was not formed until the 1950s. To cut a long story short, the headphones were manufactured by IBM. I was not aware that they made headphones, but of course, given that they were involved in office management systems they probably had various transcription products. My guess now is that Grado borrowed from the IBM design. Does anyone have experience of IBM headphones or any knowledge of whether Grado borrowed from IBM?

In the meantime, here is an interesting link on the subject.

https://www.youtube.com/watch?v=pyppNVneFMg