Mitty Supply is a company that sells portable milking equipment to small to medium-sized dairy farms at quite low prices. A portable milking machine is a simple device for extracting milk from animals. Mitty Supply is a company that sells portable milking equipment to small to medium-sized dairy farms at quite low prices. A portable milking machine is a simple device for extracting milk from animals. Mitty Supply is a company that sells portable milking equipment to small to medium-sized dairy farms at quite low prices. A portable milking machine is a simple device for extracting milk from animals.