I would think that a positive ID on the website of their financial business partner would be official enough for the category overseers.
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The only link I can find to what appears to be the house flag colours of a Reederei Lüdtke KG is shown below. Other vessels linked to the Lüdtke name have, in the past, carried the same colours, Where known I have included links to them as well. I assume it is a family run shipping company as far as I can tell. No website to my knowledge.
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Reederei Lüdtke KG
http://www.shi-treuhand.de/html/partner.html
Jenna Catherine - IMO 9109081
Http://www.shipspotting.com/gallery/photo.php?lid=577169
Bonnie Rois - IMO 9178422
http://www.shipspotting.com/gallery/photo.php?lid=1198831
Ute Johanna - IMO 9118355
http://www.shipspotting.com/gallery/photo.php?lid=979528
Sybille - IMO 9002128
http://www.shipspotting.com/gallery/photo.php?lid=75774
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