Photograph of an employee shift schedule at Basic Magnesium, Inc.   Creator:   Basic Magnesium, Inc. ( Contributing Institution ) Publication Date:   1942-07-06 Type:   Photograph Source Institution:   Henderson District Public Libraries Holding Location:   Henderson District Public Libraries Subject Keyword:   Signs and signboards Hours of labor Shift systems Bus conductors (Electricity) Silver Genre:   Photographs Photograph of an employee shift schedule at Basic Magnesium, Inc.