Fourier multipliers on extensions of Heisenberg type groups and the contraction from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>K</mml:mi> </mml:math> to <mml:math xmlns:mml="
<jats:p> If <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>G</mml:mi> <mml:mo>=</mml:mo> <mml:mi>K</mml:mi> <mml:mi>A</mml:mi>...