在羽毛高尔夫球时代，仅有两种高尔夫球杆被使用，一种是带有大凹杆面的沙铁杆，另一种是杆头很小的。
Only two types of irons were used during the feathery ball era, the sand iron with a large concave face and the rut iron which had a very small head.
并从结构设计及铸造工艺设计两方面提出了防止球铁井盖上表面缩凹的措施，这些方法在生产实践中已得到检验。
Some prevention methods were proposed from two aspects of structural design and casting processing which has been verified by production practice.
并从结构设计及铸造工艺设计两方面提出了防止球铁井盖上表面缩凹的措施，这些方法在生产实践中已得到检验。
Some prevention methods were proposed from two aspects of structural design and casting processing which has been verified by production practice.
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