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pat2691152.pdf 978.87 KB 🧲
pat2691153.pdf 1.07 MB 🧲
pat2691155.pdf 1.52 MB 🧲
pat2691157.pdf 806.22 KB 🧲
US2802203A.pdf 604.62 KB 🧲
US2897482A.pdf 414.75 KB 🧲