English: Image depicts figure 1 from the patent application of John Walch for the w:Walch Revolver. The revolver was capable of firing 12 rounds using 6 chambers.
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Original source is the patent application US22905 A of John Walch, published and submitted in 1859. Proximate source is image 1 from the patent application here, from which this image is derived (rotated, cropped).
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