Possibly a a board from a custom phototypesetter that drove a CRT to expose the photomask (film)?
On 12/06/2016 06:57 PM, Chris Pye wrote:
I’m moving my collection and found this board amongst some others. https://drive.google.com/open?id=0B0m4VYF4tIU5aXJMSHBwUDJMUWM <https://drive.google.com/open?id=0B0m4VYF4tIU5aXJMSHBwUDJMUWM> Cheers, Chris