I worked in an ATC tower with the Marines, and we used the AN/FPN-63 as our precision approach radar. It came into existence around 1958, I believe. The scopes looked something like this, but even more primitive: https://upload.wikimedia.org/wikipedia/commons/b/ba/PAR_Scop...

It was maintained with duct tape, gummi bears, and black magic, as the suppliers for said parts had long, long since gone out of business.