HTML5 and CSS3 Beginner Tutorial 19 Div and Span

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400 Years Anniversary, the invention of the Mechanical Calculator by Wilhelm Schickard in 1623. Addition and Subtraction with automatic tens carry. Multiplic...

Mechanical Calculator, Wilhelm Schickard, 1623, Addition, Subtraction, Multiplication, Division, automatic, manual, tens carry, anniversary, 400 years, pascaline
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