华盛顿郊区卫生委员会实施了一项手动控制的预防性维护计划，包括文书记录和手写的现场检查清单。使用手动系统收集的数据将为未来的自动化系统提供第一步。包括数字。

The Washington Suburban Sanitary Commission implemented a manually controlled preventive maintenance program consisting of clerical records and handwritten field check lists. Data collected using the manual system will provide the first step for an automated system in the future. Includes figures.