First appearance of a Laptop from 1937

Interesting. [Link]

Probably the earliest depiction of a communication device resembling a laptop has been discovered in an ancient Flash Gordon comics by Mende Petreski of Prilep, Macedonia.

Browsing through his comics collection, Mr. Petreski stumbled upon a panel in Politikin Zabavnik weekly published June 14, 1974, featuring the forces of Ming the Merciless using a device which looks a lot like a laptop to talk to their leader.

This particular comics represents a Serbian translation of an episode drawn around 1937 by Alex Raymond. The title the magazine used is "Ming's Prisoners", while the contents probably covers part of the story "The Outlaws of Mongo" which the Flash Gordon Wiki attributes to Alex Raymond and Don Moore, originally published as Sunday comics from August 15, 1937 – June 5, 1938.

The Wiki mentions the spacephone as a "communication device used on Mongo," but makes no mention about the laptop-like apparatus.

But did it run Mac, Windows or Linux?