File:Sikorsky R-4 3-view line drawing.png

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Description
English: A 3-view line drawing of the Sikorsky R-4.
Date
Source AN 01-230HA-2, Page vi. Scanned and provided via email by Patrick Hibbard of the eBay account Warbirds and Trains. Full manual available for purchase via eBay.
Author U.S. Military via Patrick Hibbard

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This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
Public domain
This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States.

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This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.


Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.

File history

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Date/TimeThumbnailDimensionsUserComment
current01:24, 29 March 2023Thumbnail for version as of 01:24, 29 March 20232,008 × 2,573 (465 KB)Noha307 (talk | contribs)Remove background and imperfections
00:42, 29 March 2023Thumbnail for version as of 00:42, 29 March 20232,008 × 2,573 (2.3 MB)Noha307 (talk | contribs)Grayscale
00:40, 29 March 2023Thumbnail for version as of 00:40, 29 March 20232,008 × 2,573 (5.17 MB)Noha307 (talk | contribs)Uploaded a work by U.S. Military via Patrick Hibbard from AN 01-230HA-2, Page vi. Scanned and provided via email by Patrick Hibbard of the eBay account [http://www.ebay.com/str/warbirdsandtrains Warbirds and Trains]. Full manual available for purchase via [http://www.ebay.com/itm/253825259817 eBay]. with UploadWizard

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