Today in 1876, US Patent 185565 A was issued, an invention of Wilhelm Noll, for his “Improvement in Liquid Forcing Apparatus.” There’s no Abstract, although in the description it includes these claims:

The invention consists in the combination of an air-pump and an air Washer or purifier, with a tapping-plug and a discharge tube, the several parts being connected with each other so as to be portable and capable of being attached to a barrel or keg.