Which mathematical product design innovation was marketed with the slogan 'Now everyone can handle a slide rule' when it was introduced to make mathematics more accessible?

The design of mathematical tools and products has evolved significantly over centuries, influencing how we learn and apply mathematical concepts. From ancient counting devices to modern digital tools, product design in mathematics has shaped both education and professional practice. This poll tests your knowledge about a famous mathematical product design that revolutionized how calculations were performed and visualized.

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The Curta mechanical calculator
The Pickett N600 'Eye Saver' Yellow slide rule
The Hewlett-Packard HP-35 scientific calculator
The Brunsviga mechanical calculating machine