Get, It is a cool photo from the past, shows that the factory put the tires on using a gun, perhaps later the wheel nuts were set to torque value. Maybe the tire gun had a torque attachment not sure.
Sorry I tried to use the google translator to translate it into English without sussess. Still I think the photos tell a nice story for non German speaking members ..... As the saying goes "a picture is worth a 1000 words"
The drafting office photo brought back memories for me when I started as a junior draughtsman in Germany... Long .... Long ago