File:Patent US620619 1.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:18, 23 May 2018 | ![]() | 1,986 × 3,138 (1.07 MB) | Simtropolitan | {{Information |description ={{en|1=Patent for a wood pulp grinding machine for paper making, patented by {{w|Ashley B. Tower}} and Joseph H. Wallace in 1899.}} |source =[https://patents.google.com/patent/US620619A Google Patents; US620619A] |author =A.B. Tower & J.H. Wallace |date =1899-03-07 |permission ={{PD-US-patent-no notice}} }} Category:D. H. & A. B. Tower Category:Patents from the United States Category:Pulp and paper industry |
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