3. World Broadcasting Co. occupied the studios before, during and after
WWII. I'm not sure if they were directly after NBC or if there was an
interim occupant. Retired Columbia engineer Frank Laico told me he worked
for World Broadcasting both before and after his WWII service, in that
space.
4. In 1948, WMGM moved into the entire space, according to histories of
WHN/WMGM I've been able to locate.
5. When Loews/MGM bought an interest in Fine Sound in 1952 (they licensed my
father's PerspectaSound 3-channel optical soundtrack system), they
apparently moved WMGM to smaller quarters in the space and took over the big
studios (A, B, and C) for Fine Sound. By that time WMGM was moving more to
music-playing and small-format talk radio, so they did not need the big
studios anyway. MGM may have taken over one or more of the big studios
previously to do movie-sound mixing before licensing PerspectaSound. I'm not
clear on MGM's timeline except that WMGM was definitely in the space that
became Fine Sound Studio C later on as of 1949.
So the parts of the timeline I'm fuzzy on are between NBC and WMGM and what
MGM movie studio was doing in the space (if anything) before 1952.