Logo of <a href="https://en.wikipedia.org/wiki/Calma" class="extiw" title="en:Calma">Calma</a>
Calma Company
Own vectorization, adapted from <a rel="nofollow" class="external free" href="https://ia902906.us.archive.org/13/items/bitsavers_calmaGDSIIlNov78_9461861/GDS_II_Users_Operating_Manual_Nov78.pdf">https://ia902906.us.archive.org/13/items/bitsavers_calmaGDSIIlNov78_9461861/GDS_II_Users_Operating_Manual_Nov78.pdf</a>