现在各种新的齿形层出不穷，如日本日立的齿形，日本神户齿形，瑞典斯达尔（Stals）齿形，极大地提高了螺杆压缩机的性能。
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Mr Stals has also allowed unit trusts (mutual funds) to invest up to 10% of their total assets abroad.
ECONOMIST: South Africa
Also perturbing, though long expected, was the recent announcement that the governor of the Reserve Bank, Chris Stals, would be replaced next year by a politician, Tito Mboweni, currently the labour minister.
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