I worked in an ATC tower with the Marines, and we used the AN&#x2F;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: <a href="https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;b&#x2F;ba&#x2F;PAR_Scope.jpg" rel="nofollow">https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;b&#x2F;ba&#x2F;PAR_Scop...</a><p>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.