Actually it is a little more complicated than that. Think Military intelligence.
Some items went to AN and some remained TO and NavAer. Some went to AN even tho only one service used the aircraft/engine involved.
Prewar the Army was using TOs for the Curtiss P-36 but I am not sure when they came in.
Post war they have gone their separate ways with joint publications having three different numbers even tho the contents are identical - this is called Empire Building or a big waste of taxpayers money.
View attachment 502421