Excavation using a backhoe or excavator is commonly used to dig a basement. The material is excavated by clamshell excavator bucket on crane. Directly behind were the burial pits, dug with a crawler excavator. Between 1942 and 1943 the extermination centre was further redeveloped with a crawler excavator. Crasswell attempts to stop Bolt with a hydraulic excavator. It is the earliest type of power shovel or excavator. A bucket-wheel excavator (BWE) is a large heavy equipment machine used in surface mining. In 1949 the plant produced the first dragline excavator. Followed by a Hydraulic excavator the TU in 1951. The next year, the first 360-degree excavator was introduced, the JCB 7. Trolleys may have been damaged by an excavator or other heavy equipment. Cappelotto makes various powered cleansing equipment including CAPGEO (a model of suction excavator). Heavy equipment such as excavator were sent to Banten and Lampung. A walking excavator or popularly spider excavator is a special type of all-terrain excavator. Grimshaw of Boulton & Watt devised the first steam-powered excavator in 1796.