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並前往https://books.google.com.tw/books?id=6nnNAAAAMAAJ&pg=PA1196&lpg=PA1196&dq=numberblocks+squares&source=bl&ots=_uzJ3ATDXG&sig=ACfU3U2-KtFeo26U9NxXcOutFyFcbYjbuw&hl=zh-TW&sa=X&ved=2ahUKEwiDx4fHpfj4AhUu3jgGHdYoBA4Q6AF6BQjQARAD

Official Gazette of the United States Patent Office: Patents

... base plate with a pattern of regularly spaced square projections to which ... has a higher concepts comprises a set of number blocks with separate pegs ...

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