image is a derivative work of the following images: File:Continental_Standard_typewriter_keyboard.jpg licensed with Cc-by-sa-3.0, GFDL 2009-07-03T09:14:48Z...
June 2007 Source Own work Author Sommeregger Other versions Derivative works of this file: Continental Standard typewriter keyboard - key detail.jpg...
href="https://archive.org/details/sim_raw_scan_IA1591531-06/page/n774" rel="nofollow">IA1591531-06</a>. Previous issue: <a href="https://archive.org/details...
