Holek "assault pistol"
The prolific Czech designer Vaclav Holek
reputedly developed an early submachine gun-type weapon in the early 1920s
while he was working at Praga Zbrojovka. This weapon was apparently known
as the "assault pistol" or "attack pistol", but it was only made in
prototype form and was never fully produced. Details about the design are
unknown, although it may have been influenced by Austro-Hungarian SMG
projects from World War I such as the similarly-named Sturmpistole.