What Were Mark Twain's Inventions?

In addition to being a famous author and humorist, American writer Mark Twain was also responsible for inventions like the adjustable bra strap.

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USPTO on X: #OTD in 1871 Samuel Clemens, better known as Mark Twain, received a patent for an “improvement in adjustable and detachable straps for garments,” an alternative method for tightening clothing.

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What Were Mark Twain's Inventions?