Primary station protector.
Primary station protector. An assembly which complies with RUS Bulletin 345-39, RUS Specification for Telephone Station Protectors. Copies of RUS Bulletin 345-39 are available upon request from RUS, U.S. Department of Agriculture (USDA), 1400 Independence Avenue, SW., STOP 1522, Washington, DC 20250-1522, FAX (202) 720-4120.