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File:Holt tractor-type patent.png

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Description
English: Holt Machinery Company patent for a track-type tractor, number #1076578. Filing date: 18 Feb 1913; issue date: 21 Oct 1913.
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Source http://www.google.ca/patents?id=NTdvAAAAEBAJ
Author U.S. Patent Office
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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current04:21, 25 February 2010Thumbnail for version as of 04:21, 25 February 2010612 × 991 (50 KB)Btphelps{{Information |Description={{en|1=Holt Machinery Company patent for a track-type tractor, number #1076578. Filing date: 18 Feb 1913; issue date: 21 Oct 1913.}} |Source=http://www.google.ca/patents?id=NTdvAAAAEBAJ |Author=U.S. Patent Offcie |Date= |Permiss

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