This advertisement did not have a copyright notice and is in the public domain.
From the US Copyright Office Circular 3. Page 3, Contributions to Collective Works. (A magazine is a "collective work.")
A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
== {{int:filedesc}} == {{Information |Description={{en|1= Signetics 2650 8-bit microprocessor advertisement in October 30, 1975 issue of ''Electronics'' magazine. Pages 114–115.}} |Source=Scanned from the October 30, 1975 ''Electronics'' magazine by ...