Help needed on two old autographs

Hello everyone,

I have recently purchased a bunch of old motorsport autographs. To my surprise there have been some very well known pre II ww legends amoung the autograps such as Kling, Linge as well as a Fangio. Unfortunatly there are two autographs I can't tell. I asume that the two had to do something with motorsport as the collection was mostly about Mercedes Benz Motorsports. Anyway, can someone tell me who are the two people (guy in the middle and the woman on the right). The left one is Hahn a infamous Mercedes driver. Any hints would help. So thanks for every comment.
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Many Thanks guys.