The german online phone directory (www.teleauskunft.de) shows many Wamhoff,
but only one email-adress:

Wamhoff Gilda & Karsten, kagiwa@t-online.de
49525 Lengerich

You should write to them.

Lengerich is located in Osnabrück area.

Rulle is a part of Wallenhorst, close to Osnabrück. There you can find three addresses.

Speilmann could be Spielmann.

I forward your mail also to Hannover-List, because Osnabrück was former a part of the old Kingdom of Hannover.