水密装置 water stop ; watertight fittings

紧密装药 tight loading

数据保密装置 data privacy device

加密装置 encryption unit ; encryption device ; Encryption machines and supplies

通信保密装置 communication security device ; COMSEC

单通道加密装置 single channel encryption device

计算机加密装置 computer encryption device

中继加密装置 trunk encryption device

载波加密装置 carrier encryption equipment

最密装填 closest packing