Photograph of switchboard operators at Basic Magnesium, Inc.   Creator:   Basic Magnesium, Inc. ( Contributing Institution ) Publication Date:   1943-03-18 Type:   Photograph Source Institution:   Henderson District Public Libraries Holding Location:   Henderson District Public Libraries Subject Keyword:   Telephone switchboards Baldwin, Mary Clary, Eleonara Buckley, Mildred Elsea, Velma Genre:   Photographs Photograph of switchboard operators at Basic Magnesium, Inc.