Today in 1935, US Patent 2006450 A was issued, an invention of John J. Gaynor, for his “Capping Machine.” There’s no Abstract, although in the description it includes this summary:

This invention relates to capping machines, or more particularly to bottle crowners of the double head type.

One of the objects of the invention is to provide such a machine of the simplest construction with a minimum number of actuating parts so as to promote compactness, and at the same time insuring reliability and effectiveness in operation; and whereby the caps as applied to containers by both capping heads will be uniform.

Another object of the invention is to provide such a capping machine that can be closely arranged in cooperative relation with the container conveying means of a rotary type container filling machine, so that the containers will be capped shortly after being transferred to the capping heads of the capping machine alternately. The type of filling machine referred to includes a circular rotating container conveyor having peripherally arranged vertically reciprocal container supports in which the containers are placed to be raised into filling heads which depend from the circular liquid supply tanks placed above the conveyor and connected to rotate therewith. As a rule the tank is of greater diameter than the conveyor, which relation of parts presents the problem in arranging the capping mechanism in close cooperative relation with the conveyor.