When Installed so that porcelain base and metal rings are held by solder so that they cannot turn In sign face, Cat. Nos. .... Nos. 304-05, 330. a#39;Weatherproof, porcelain, keyless. Cat. No. 303; 660 W, 600 V, Cat. No. 303C. Marking: aquot;F. E. Co.
|Author||:||National Board of Fire Underwriters, Underwriters' Laboratories, National Fire Protection Association|