Ramp plate placing machine, National Gypsum Company
A ramp plate placing machine is shown in the National Gypsum Company shipping room. The National Quarry (Tawas Quarry, Tawas Mine?) is an open pit gypsum mine near National City, Michigan operated by the National Gypsum Company. The mine was an important gypsum producer in Michigan for decades. The National Gypsum Company began working the gypsum deposit here in 1925 and the existing town was renamed National City.