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John Napier created "Napier's Bones" which were a set of rods that could carry out complex calculations.
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In 1906 Lee De Forest created the vacuum tube which is considered one of 3 main technological advances that led to the development of the computer industry.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.