transfer function matrix
... that the first use of a transfer function matrix in control systems was on development of gas turbine engines for the National Advisory Committee for Aeronautics?
... that the first use of a <b id="mwBQY"><a href="./Transfer_function_matrix" id="mwBQc" rel="mw:WikiLink" title="Transfer function matrix">transfer function matrix</a></b> in <a href="./Control_system" id="mwBQg" rel="mw:WikiLink" title="Control system">control systems</a> was on development of gas turbine engines for the <a href="./National_Advisory_Committee_for_Aeronautics" id="mwBQk" rel="mw:WikiLink" title="National Advisory Committee for Aeronautics">National Advisory Committee for Aeronautics</a>?