File:Koelbel Apparatus Image From Patent 3268225.png
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current | 14:42, 21 August 2023 | 1,384 × 2,175 (71 KB) | Obscure2020 | Extracted original image from PDF source using Inkscape. Re-cropped using GIMP. Then optimized with OxiPNG and ZopfliPNG. | |
07:05, 4 August 2020 | 621 × 978 (465 KB) | Malev | Uploaded a work by G. F. KÖLBEL from https://patentimages.storage.googleapis.com/52/2d/06/08b9f8c9e3cf21/US3268225.pdf with UploadWizard |
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