Kane, Dalsimer, Kane, Sullivan and Kurucz
Radio controlled model aircraft control system
 A method and apparatus are disclosed for the emergency control of model aircraft. The incoming signals to the model are screened and, if missing or outside acceptable limits, the screened signals are replaced with a sequence of preprogrammed emergency signals which control the model into an emergency procedure. 
Grundig E.M.V.
G G G A G
G05D G08C G08C A63H G05D
inventional inventional inventional inventional inventional
Heinz
Meyer