This portable electric pump dates from many decades ago, when the wine industry was becoming increasingly industrialized after the Volstead Act was repealed in 1933, bringing fifteen years of the Prohibition finally to an end.
Equipment was getting smaller and increasingly efficient at this point, and cellars were becoming more active as the blending of wines became more common. This required pumping them from barrel to barrel frequently.
The pump is mounted on a cart so it could be easily moved about the wine cellar, with an electric motor that drove the pump by means of a flat belt. Equipment like this is still in use in wineries today.