The gremlins were a WWII invention?
Accordingly, the notion about this havoc-creating little monsters was first developed during the Second World War; they were jokingly blamed for the little mechanical problems WWII-era planes ran into.

The concept grew and…the rest is history.


Gremlins

Diagram of what the Germans regarded as the ideal layout for a "Tobruk" fortification incorporating an obsolete/disused tank turret, mounted in concrete.  Circumstances often did not permit such a neat arrangement to be achieved.  A "Tobruk" could also be incorporated in another, larger fortification - as in the 10.5 casemate/bunker now occupied by the Channel Islands Military Museum.  Best regards, JR.

"Tobruk" fortification - standard layout.

A German postcard printed during the war years. 