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US08602325B2 Hydraulically actuated sprinkler nozzle cover 有权
液压驱动喷头盖

Hydraulically actuated sprinkler nozzle cover
摘要:
A sprinkler includes a nozzle and a cover configured for enclosing the nozzle. A hydraulically actuated mechanism supports the cover above the nozzle for reciprocation relative to the nozzle between a lower closed position and a raised open position.
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