4. Display and sale of products of manufacturing activities on the premises.
4. Display and sale of products of manufacturing activities on the premises. permitted as a matter of right, accessory to activities permitted as a matter of right, which activities are necessary in connection with scientific research or scientific development or related production, may be permitted upon the issuance of a special permit provided the Zoning Board of Appeals finds that the proposed accessory use does not substantially derogate from the public good.