Mathematical Educational Set - U.S. Patent Information
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Dot Cards shown on this website are a Mathematical Educational Set protected with United States Patent Number: D621,878 S. To view our Patent on the United States Patent and Trademark Office website click here.
Additionally, Dot Cards shown on this website are a Educational Set of Cards for Addition and Subtraction protected with United States Patent Number: D757,175 S. To view our Patent on the United States Patent and Trademark Office website click here.
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