Today in 1891, US Patent 457243 A was issued, an invention of Charles A. Bartliff, for his “Beer Pump.” There’s no Abstract, although in the description it includes these claims:

My invention relates to an improvement in air-pumps for forcing and compressing air in a cask; and it consists in the peculiar construction and novel combination of parts, that will be more fully set forth hereinafter, and particularly pointed out in the claim.

The object of my invention is to provide an air-pump which is adapted to force beer or other liquid from the cask by atmospheric pressure; and a further object of my invention is to provide a simple, effective, and inexpensive pump which may be operated either by foot or by hand power.