Comment: Ok, so after I saw the

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Ok, so after I saw the

Ok, so after I saw the comment about the water mark (I missed it myself) I made out what looks to be 'AirLiners.net' So I went to their site and started digging around. Under their photos, sorted by inside cabin view, I found these 2 pictures.
http://www.airliners.net/photo/Douglas-C-118B-Liftmaster/221...

http://www.airliners.net/photo/Douglas-C-54D-Skymaster/22139...

They list it as an oil-spill sprayer. I haven't found the original from this post yet, but they look similar. Maybe someone with a bit more time can dig around some more and find it. So now my question is this, Is it really an oil spill sprayer, or something else.