rtokens: The company said the switch would probably become effective in September .
pos: DT NN , VBN IN NNP NNP , VBZ TO VB NN IN DT NN IN PRP$ NNS POS NN NN .
tokens: The group , known as Munich Re , plans to seek approval for the move at its shareholders ' meeting today .
ltokens: Muenchener Rueckversicherungs AG , the world 's largest reinsurer , said on Friday it expected to switch its shares to a lower par value by September 1997 at the earliest .