Need help! Identifying ranks

Today I bought a picture frame with a picture of a part of the crew from the SMS Wettin, who followed infantry training on the SMS Wettin (zur erinnerung an unsere Infanterische Ausbildung).
Underneath the picture the names of the people are shown. In the middle are 2 higher ranked people, who gave them training I guess. But I can’t figure out their ranks. It’s about the following abbreviations:

Ob.-Hzr (or Ob.-Hrr)
M.-Mt

Ob. stands for Oberst I think and M. for Major.

Anyone who knows more?

1051677


Click to enlarge the picture


 


 

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