Abstract: An explosive actuated acoustic device emits sound to be used in torpedo countermeasures. Numbered devices are delivered over an extended area and sink through the water. The devices are actuated at different times as they sink, to provide sound masking over an extended period of time. The devices also include safety devices which prevent premature actuation from jarring or jolting and from impact with the water.

Abstract: A propellant operated, single shot, silent stud gun attachment device used to attach various articles to structures. The device is particularly suited to use by military units for attachment of munitions or mines to structures such as bridges or buildings. The device utilizes an initiation device attached to a barrel in proximity to a cartridge containing a piston. The initiation of the cartridge is used to drive the piston into a stud and in turn drive the stud into a structure. The entire device becomes attached to the structure, thereby providing a means by which to quietly attach articles to the structure.