What did Mark Twain invent? How much of #1 did Mark Twain sell? Were the sales of #2 not enough to turn a profit?
Mark Twain
Twain patented three inventions. Twain created and sold over 25,000 self-pasting scrapbook creations. Twain invented an improvement in adjustable and detachable straps for garments to replace suspenders.
American author and humorist
Was Mark Twain a struggling inventor?