What is the third P67 electrical contect point for?

Pentax 6X7 have 3 electrical contect points on top of the body. The TTL meter used 2 of them. Any one know what is the 3rd point for?

For fluse? For auto EX? If any function there then how to use it?

Thank you for any responses.

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Regards,

C. L. Yuan

C.L.,

Perhaps for a more advanced metering system. One that you don't have to keep turning on??????? I doubt they will go to autofocus - but maybe. As the metering system is the only thing that can use these contacts lets hope it is used soon. I hate having to constantly turn on my meter - usually at a CRITICAL time.

Steve