A semi-automatic transmission is where by a lot of the Procedure is automatic (often the actuation from the clutch), but the motive force's enter is needed to move off from the standstill or to change gears. Automatic gearboxes appeared commercially from the forties, based on the International Journal of Automobile https://automobile-gearbox40505.blogaritma.com/32430261/the-single-best-strategy-to-use-for-automobile-gearbox