专利名称：MAINTENANCE TOOL 发明人：JOHN L. MECHAN小学广播稿
申请号：US3651556D
申请日：19700515
公开号：US3651556A炮的简笔画
公开日：
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摘要：A maintenance tool usable by workmen involved in the maintenance of hydraulic systems such as water-line installations for homes and other buildings. The tool is constructed for each valve removal and replacement, and line removal and replacement, without the necessity of shutting off water pressure relative to the main or branch line affected. Flared guide means is employed in the tool for directing water streams centrally of the tool for proper valve or other installations.
中国工会审计条例>家访活动记录表申请人：JOHN L. MECHAN
龟蛇酒
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