Today in 1944, US Patent 2348797 A was issued, an invention of Louis A. Fischer, assigned to the Schaefer Brewing Co., for his “Crown Cap Selecting Machine.” There’s no Abstract, although in the description it includes this summary:

This invention relates to crown cap selecting machines, and has for its object to provide means for inspecting the interior of such machines while the same are running, and also provide means for preventing the caps from clogging during the operation of the machine.

In the use of such cap selecting machines, it frequently happens that inspection of the interior of the same becomes necessary and also that certain caps which have become clogged be removed. Also certain foreign matters must be dislodged.

This requires a shutting down of the machine and a re-starting, this requiring several hours of non-use of the machine.

The invention consists of a door closed opening which permits the caps to be ejected from the machine, capable of being opened and closed during the operation of the machine, and the invention also consists in the means for preventing clogging of caps.