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wire wheels equipped with splined hubs and a quick-release "knockoff" (central wing nut) locking cap that could be unscrewed by striking a wing of the nut with a special alloy mallet or "knockoff hammer". Some jurisdictions, including the United States and West Germany, prohibited eared hubcaps for safety reasons in the late 1960s. In response, some manufacturers (e.g. Maserati) preferred to hold the wheel on the splined hub by capping with a single conventional

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