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A combination between a whiteboard and a cork bulletin board Original early 1960s ad for "Plasti-slate", the first whiteboard/dry erase board invented by Martin Heit. It has been widely reported that Korean War veteran and photographer Martin Heit and Albert Stallion, an employee at Alliance, a leading flat rolled steel sheet supplier should be credited with the invention of the whiteboard in ...
Apparently the earliest Mesoamerican calendar to be developed was known by a variety of local terms, and its named components and the glyphs used to depict them were culture-specific. However, it is clear that type of calendar functioned in essentially the same way across cultures, and across the chronological periods when it was maintained.
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