The mill/farm supply/ hardware store might still do a small amount of feed mixing, as evidenced by the auger tucked alongside the building.

These small bins were used to store ear corn, shelled corn, and grain at one time.

The rear milling/receiving area of the structure is fairly uncluttered, another reason to think that milling is still done here.

The store boast Vangard Paints, and Kent Feeds. These feeds would be already mixed up according to type and ready to sell. The auger is situated so grain and corn can be shoveled to the auger intake after being dumped on the ground by the wall, then conveyed into some bins in the second story just inside the open window under the roof.