File:Patent US620619 1.png

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Summary

Description
English: Patent for a wood pulp grinding machine for paper making, patented by Ashley B. Tower and Joseph H. Wallace in 1899.
Date
Source Google Patents; US620619A
Author A.B. Tower & J.H. Wallace
Permission
(Reusing this file)
Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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inception

7 March 1899Gregorian

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Date/TimeThumbnailDimensionsUserComment
current02:18, 23 May 2018Thumbnail for version as of 02:18, 23 May 20181,986 × 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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