I don't know for sure, but here are some suggestions and starting points to look at with your own research. All of the people I'm about to name had popular mass-produced semi-auto pistols. As you know there is often a big difference between when a certain kind of thing is "invented" and when it becomes popular and available for the public to buy.
Hugo Borchardt had a semi-automatic pistol in the early 1890s.
This gun was the inspiration for the famous Luger pistol, invented by Georg Luger in the early 1900s.
Paul and Wilhelm Mauser produced a semi-automatic (and fully automatic too) military pistol called the C96 Mauser or "broom-handle" Mauser back in the middle 1890s.
John Moses Browning designed a number of semi-auto handguns, both small and large, in the late 1890s through the WWI years. The famous Army model 1911 pistol is what he was most famous for, but an earlier version of this kind of gun, in a smaller caliber, came on the market in 1903, and it was very successful. Browning designed a lot of guns for the Colt company.
1885 Mannlicher rifle. Strangely enough, Hiram Maxim invented the machine gun 2 years earlier.
The Borchardt, in 1893, was the first commercially successful auto pistol.
To determine if a gun is in Semi auto, dry fire the gun a few times. If it is simply doing single shots then it is in Semi auto. If it is say doing a few single shots but then ramping, it maybe in PSP or NPPL mode.
22 cal semi auto ww2 style gun 22 cal semi auto ww2 style gun
hello this is a good midrange gun and yes it will shoot semi auto but if you live in the UK then it will only shoot semi auto if it is also bought in the UK it will only shoot semi auto too because that is the law as in other countries it is legal for it to shoot full auto.
The semi-auto rifle
You have described it; a 22 LR semi-auto
Semi-auto - the trigger must be pulled every time you want a round to be fired Fully-auto - the trigger is only pulled once and the weapon fires until all ammunition in the feed device is exhaused.
None.
It might be a S&W semi-auto
You only have to cock it if it is a spring gun.
1115 is when the first gun was invented