The history of the paper clip: It was invented in 1899. It hasn't been improved upon since.
Swank - Sterling Silver - Tie Clip Bar with Chain - Patent - EZ Office Products
Crazy Patent Troll. Vector Clip Art Illustration With Simple Gradients. Elements On Separate Layers For Easy Editing. Royalty Free SVG, Cliparts, Vectors, And Stock Illustration. Image 40655823.