3x25mm, TX10

    • neidu3@sh.itjust.worksOP
      link
      fedilink
      English
      arrow-up
      4
      ·
      edit-2
      4 hours ago

      The last related patent for Philips expired in the 60’s. No royalties are required since then. Also, the patents were filed with USPTO, which nobody outside the US care about.