Browse Items (1 total) Tags: Central Controls Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Photos from Sand and Gravel Co. Photograph of worker at Central Controls, Sand and Gravel Co. Photograph of the conveyor belts at the Sand and Gravel Co. Tags: BS2066, BS2067, Business, Central Controls, Construction Materials, Conveyor Belt, Gravel, Sand, Sand and Gravel