Ballistic resistant body covering
A ballistic resistant body covering for protecting the torso, groin and neck area from ballistic missiles.
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| Number | Title | Issue Date |
| 4868539 | Bi-directional multi-frequency ripple control system A ripple control system in which an audio frequency signal is superimposed on an electric power distribution system wherein the receiver has a pair of lock-in amplifiers driven 90° out of phase with each other, the outputs of which are squared and summed... | 09/19/1989 |