The Ruston Steam Shovel in operation (title on object), The steam-driven excavator (Ruston Steam Shovel) in operation in the pit of the open mine. Part of the loose-leaf photo album presented by the staff of the Boekit-Asam Coal Mines in Sumatra to the outgoing Engineer-Director H. Tromp on January 7, 1922., photograph, anonymous, Boekit-Asam, 1921 - 1922, photographic support, gelatin silver print, height, 279 mm × width, 392 mm.
The Ruston Steam Shovel in operation (title on object), The steam-driven excavator (Ruston Steam Shovel) in operation in the pit of the open mine. Part of the loose-leaf photo album presented by the staff of the Boekit-Asam Coal Mines in Sumatra to the outgoing Engineer-Director H. Tromp on January 7, 1922., photograph, anonymous, Boekit-Asam, 1921 - 1922, photographic support, gelatin silver print, height, 279 mm × width, 392 mm