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| View Original: | Plasti-slate 001.jpg (1700x2338) | |||
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| Keywords: Plasti-slate 001.jpg en Original early 1960's ad for Plasti-slate the first whiteboard/dry erase board invented by Martin Heit 2013-06-17 08 44 03 Martin Heit inventor of the whiteboard/dry erase board Martin Heit inventor of the whiteboard/dry erase board Custom license marker 2013 06 17 Uploaded with UploadWizard Check categories 2015 May 17 Whiteboards | ||||
