Abstract: A deployable security barrier system (10, 10?, 110) is formed by deploying bullet-proof or bullet-resistant barrier fence sections (26, 26?, 28, 28?). A control system which enables rapid deployment of the sections to form across a hallway or other closed area a barrier fence (30, 130) which is high enough to prevent or at least greatly impede a person from passing through or over the fence. The barrier fence (30, 130) may extend from floor to ceiling or to a fixed barrier extending downwardly from the ceiling. The barrier fence may have at least one transparent section (26a, 28a) to enable law enforcement or security persons to observe the situation on the other side of the barrier fence. The controls also permit at least partial opening of the barrier fence to enable law enforcement or security personnel to pass through it as needed. Supplemental alarm and/or distracting and/or disabling agencies may be deployed in addition to the barrier fence (30, 130).

Abstract: A deployable security barrier system (10, 10?, 110) is formed by deploying bullet-proof or bullet-resistant barrier fence sections (26, 26?, 28, 28?). A control system which enables rapid deployment of the sections to form across a hallway or other closed area a barrier fence (30, 130) which is high enough to prevent or at least greatly impede a person from passing through or over the fence. The barrier fence (30, 130) may extend from floor to ceiling or to a fixed barrier extending downwardly from the ceiling. The barrier fence may have at least one transparent section (26a, 28a) to enable law enforcement or security persons to observe the situation on the other side of the barrier fence. The controls also permit at least partial opening of the barrier fence to enable law enforcement or security personnel to pass through it as needed. Supplemental alarm and/or distracting and/or disabling agencies may be deployed in addition to the barrier fence (30, 130).

Abstract: A device for underwater detection of flaws in welds, especially lap welds as distinguished from butt welds wherein a filleted weld is made, said device embodying ultrasonic transducers arranged to emit and receive a sonic beam at angles such as to pass through the weld at an angle corresponding substantially to the inclination of the weld and to be adjustable for welds of different inclination and for beam travel through different configurations of weldments.

Abstract: A system for non-destructive underwater evaluation of structures comprises an ultrasonic testing means, such as a transducer, means for converting the output thereof into a visual signal, such as an oscilloscope, and means for conveying that visual signal to the underwater technician who is operating the ultrasonic testing means. The means for transmitting the visual signal may comprise an underwater television or other monitor, connected either to a television camera which photographs the output of the oscilloscope or other visual display device, or other means, such as an auxiliary cathode ray tube display device, can be hooked directly to the visual display device. Preferably recording means, such as a video tape recorder, is connected, together with the underwater monitor, to make a permanent record of the monitored signals.