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1. The developer of the first proto-writing, circa 30,000 B.C.

2. The developer of the first writing, circa 7,000 B.C.

3. The inventor of papyrus, circa 4,000 B.C.

4. The inventor of the alphabet, circa 1,700 B.C.

5. The inventors of the number system, including zero, circa 3,400 B.C. to 700 A.D.

6. Johannes Gutenberg, inventor of the printing press, about 1440 A.D.

7. Charles Babbage, inventor of the Difference Engine, the first modern computer, 1822 A.D.

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