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A make of tractor operated cultivator with a rear spike-ridged roller to firm the cultivated soil. The operating mechanism disturbs the soils and buries stones below a surface layer of replaced soil. There are 6 models, all with a working depth of 170mm except model SB100 which has a working depth of up to 150mm:
• SB100: working width of 1m; a weight of 450kg; with a power need of >20hp.
• SB120: working width of 1.2m; a weight of 500kg; with a power need of >20hp.
• SB140: working width of 1.4m; a weight of 600kg; with a power need of >35hp.
• SB160: working width of 1.6m; a weight of 700kg; with a power need of >40hp.
• SB180: working width of 1.8m; a weight of 800kg; with a power need of >50hp.
• SB200: working width of 2m; a weight of 885kg; with a power need of >55hp. They are manufactured by GKB Machines.