Favorite this☆ Motorless flashers for electric signs and advertising Description: Motorless flashers for electric signs and advertising / Phelps Mfg. Company. Title from cover. Details Resource ID: bh015537 Creator: Phelps Manufacturing Company Subject: Electric signs--Michigan--Detroit Lighting--Equipment and supplies Pamphlets Note (Source): Bulletin no. 5 Date Issued: 1910-03-01 Format: 8 unnumbered pages : illustrations ; 6.5 in. Member of: Burton Historical Collection Filing Location: E&M 977.4D4 381 P Rights: Physical rights are retained by DPL. Copyright is retained in accordance with U.S. copyright laws.