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Thread: Padlock puzzle - photo

  1. May 8, 2023, 02:55 PM #11
    BuffaloJohn
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    Here is one more expired patent that has an insteresting OR gate solution:

    Padlock puzzle - photo-page1-us3889497.jpg

    Padlock puzzle - photo-page2-us3889497-2.jpg

    And then there is a circular solution:

    Padlock puzzle - photo-pages-us4997219.jpg
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  2. May 8, 2023, 04:29 PM #12
    Frank S
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