31 Pa. Stat. § 511
After the thirtieth day after the effective date of this act, no state, municipal or other inspector of dairy farms shall sell, take orders for the sale, or deliver any machinery, equipment, materials, feed supplies, or any other thing used in or in connection with the production or handling of milk by producers, nor shall any such person be financially interested in, be employed by, receive any compensation from, or act as agent or solicitor, or distribute literature or circulars for, nor recommend the products of any person, copartnership, association or corporation, manufacturing or selling any machinery, equipment, materials, feed supplies, or any other thing used in or in connection with the production or handling of milk by producers.
This act does not prohibit the sale of cans, pails, strainers, strainer pads, cleansers or chlorinating, and sterilizing solutions and powders to milk producers by any distributor, or the taking of orders for such items by representatives, agents and inspectors of any distributor for and on behalf of such distributor.
31 P.S. § 511