This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
1. it was subject to Crown copyright and was first published more than 50 years ago, or
it was not subject to Crown copyright, and
2. it is a photograph that was created prior to January 1, 1949, or
3. the creator died prior to January 1, 1972.
Cal incloure una etiqueta de domini públic als Estats Units per indicar perquè aquesta obra és en domini públic als Estats Units. Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.
This work is in the public domain in the United States because it meets three requirements:
it was first published outside the United States (and not published in the U.S. within 30 days),
it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country (Canadà) on the URAA date (1 January 1996).
For background information, see the explanations on Non-U.S. copyrights. Note: This tag should not be used for sound recordings.
Historial del fitxer
Cliqueu una data/hora per veure el fitxer tal com era aleshores.
{{Information |Description=Engineer Robert Watson-Watt |Source=English Wikipedia ([http://ao.minisisinc.com/scripts/mwimain.dll/20/26/656/11327?RECORD Archives of Ontario]) |Date= 2006/12/05 |Author= Gordon W. Powley |Permission= PD-Canada |other_versions
Aquest fitxer conté informació addicional, probablement afegida per la càmera digital o l'escàner utilitzat per a crear-lo o digitalitzar-lo. Si s'ha modificat posteriorment, alguns detalls poden no reflectir les dades reals del fitxer modificat.
Vegeu la pàgina original a Commons
