博文

Sperry 炮塔

热度 1 2016-10-18 19:04

1.The sperry Retractable Ball Turret（斯佩里可伸缩球形炮塔） The Sperry lower Retractable Ball mounted in the belly of the PB4Y-1, is the deadly and efficient defender of the bomber’s once soft underside. It was built especially for the PB4Y-1 whose ground ...

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