Today in 1984, US Patent 4474255 A was issued, an invention of Stephen A. Blok and Frank A. Kapounek, for their “Beer Keg Scale.” Here’s the Abstract:

A weighing and supporting device for liquid container kegs, such as those for beer. The device comprises a flat, keg-receiving platform beneath which is located a weigh scale, the platform being pivotable between an inclined, dispensing position and a horizontal, weighing position. In the latter, the platform rests upon the scale and is free to move up and down on that scale to enable the platform and a keg supported thereon to be weighed. By taking periodic measurements of the weight of the keg supported on such a device, the need for a liquid metering device in the line of liquid flow from the keg is avoided.