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US5473129A Environmental electric switch enclosure with viewing window 失效
带观察窗的环境电器开关柜

Environmental electric switch enclosure with viewing window
摘要:
An electric disconnect switch enclosure for outdoor applications includes a viewing window to visually ascertain the ON-OFF conditions of the switch contacts without having to motivate the switch handle or open the enclosure door. The viewing window can be formed in the enclosure door in an automated manufacturing process.
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