On 02/19/2013 10:23 AM, Kent A. Reed wrote: > Finally, does anyone know what the "MBB" organization is/was? Not only > did they produce the version of the manual I'm converting, they > apparently produced their own APT4 system. Several places I have found > mention of an MBB feature. With the help of a friend, I believe I have found MBB: https://en.wikipedia.org/wiki/Messerschmitt-B%C3%B6lkow-Blohm Click on some of the "External Links" at the bottom. Very impressive bunch, even if bought/sold a few times since 1986. Kim