Needing to drive a long distance today, I invented several things. A radically different code lock, a new kind of rubber bullet, an improved belt buckle (over an original design), a mathematical method for personal identification (better than the current PIN), a new method of guiding the blind, and an improved shirt button (over an original design). I did as I usually do, and checked them on the Internet. As far as I can see, they are all new. But one further idea, I discovered had already been done. It briefly went into production some 80 years ago. OBSERVATION: I had a few code locks published in the past, by Wimborne.
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