Quoting an excerpt from your link: "there is another exception for foreign published films between 1909 and 1923 that were first published without a copyright notice"
A consequence of the twisted minds from the nutty, frequently overturned ninth circuit. (Which doesn't apply to me.) This requires some explanation:
11 The differing dates is a product of the question of controversial Twin Books v. Walt Disney Co. decision by the 9th Circuit Court of Appeals in 1966. The question at issue is the copyright status of a work only published in a foreign language outside of the United States and without a copyright notice. It had long been assumed that failure to comply with US formalities placed these works in the public domain in the US and, as such, were subject to copyright restoration under URAA (see note 9). The court in Twin Books, however, concluded "publication without a copyright notice in a foreign country did not put the work in the public domain in the United States." According to the court, these foreign publications were in effect "unpublished" in the US, and hence have the same copyright term as unpublished works. The decision has been harshly criticized in Nimmer on Copyright, the leading treatise on copyright, as being incompatible with previous decisions and the intent of Congress when it restored foreign copyrights. The Copyright Office as well ignores the Twin Books decision in its circular on restored copyrights. Nevertheless, the decision is currently applicable in all of the 9th Judicial Circuit (Alaska, Arizona, California, Hawaii, Idaho, Montana, Nevada, Oregon, Washington, and Guam and the Northern Mariana Islands), and it may apply in the rest of the country.
© 2004 Peter B. Hirtle. Use of this chart is governed by the Creative Commons Attribution-NonCommercial License. In addition, permission is granted for non-profit educational use, including but not limited to reserves and coursepacks made by for-profit copyshops. Any reproduction or modification of this chart should include the citation to the first appearance of the chart in Archival Outlook and acknowledge Laura N. Gasaway's chart, which is this chart's inspiration. -
http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm#Footnote_11