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File:Cushioned cork center baseball schematic from Evolution of the Ball.png

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Cushioned_cork_center_baseball_schematic_from_Evolution_of_the_Ball.png (559 × 554 pixels, file size: 235 KB, MIME type: image/png)

Summary

Description Cross-section illustration of a cushioned cork baseball from the article "Evolution of the Ball".
Date circa 1963
date QS:P,+1963-00-00T00:00:00Z/9,P1480,Q5727902
Source Google Books - Rawlings Sporting Goods Company Staff (1963-07). "Evolution of the Ball". Baseball Digest: 71.
Author Unknown authorUnknown author
Permission
(Reusing this file)

see File:Evolution of the Ball, Baseball Digest July 1963.djvu

Public domain
This work is in the public domain because it was published in the United States between 1930 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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Baseball Digest: This image or file was extracted from an issue of Baseball Digest published before January 1, 1964. A search of the following sources: reveals no renewals for the title "Baseball Digest" within the required period for filing. Additionally, independent research by the Library of the University of Pennsylvania, "First copyright renewals for periodicals", confirms the absence of filed renewals.
Other versions
File:Evolution of the Ball, Baseball Digest July 1963.djvu

Original caption:

The cushioned cork center baseball, which made its bow in 1931, is still in use. While baseball specifications have changed little since 1872, construction has now reached a peak of uniformity.

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Date/TimeThumbnailDimensionsUserComment
current01:03, 30 September 2009Thumbnail for version as of 01:03, 30 September 2009559 × 554 (235 KB)Struthious Bandersnatch{{Information |Description=Cross-section illustration of a cushioned cork baseball from the article "Evolution of the Ball". |Source=Google Books - {{cite journal | title = Evolution of the
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