OK tried with Path/trace but this didn't produced nice output.
I had more luck with http://vectormagic.com service which produced nice tracet svg.
With vectormagic produced svg - I don't loose part anymore (like that was case when using bitmap image inside svg).
Since I want to make fritz part of:
Beaglebone Cramps Hat
I find specifying pins very troublesome (I have 230 pins) - is there any way to import from spreadsheet or modify connectors in simple editor?