9 Transducer Elements, Electric Testers for Testing the Valve and Actuating Mechanism of Airborne Spray Tanks and Units for Maintenance and Repair Thereof; Test Fixtures-Namely, Acceptance Test Facility, Computerized Checker for Checking Electrical Harnesses and Switches and Components, and Assembly Fixtures for Maintaining, Servicing and Aligning Airborne Ejection Release Units; Electronic Fixtures for Checking Power Generating Equipment for Calibrating Engine Performance and the Controlled Programmer Performance, and Hydraulic Test Fixtures for Servicing, Alignment, Assembly and Calibration of Helicopter Towed Minesweepers; Variable Depth Transducer Simulators, and Fixtures for Electric Motors and Generators Used with Computers and Sonar Scanners; Electronic Printed Circuit Cards and Module Checkers for Checking Electronic Subassemblies; Dummy Electric Loads for Transmitters and Receivers; Simulators to Develop Shipboard Signals for Testing Sonar Sets; Hydrofoil Vessel Gauging and Alignment Units Underwater Sound Navigation and Ranging Sonar Systems-Namely, Underwater Sonar Transducers and Hydrophones, Depth Positioning and Underwater Listening Units, Ice Detection Units, Object Detection, Location and Avoidance Units, Bathymetric (Depth) Measuring Units, Variable Depth and Sound Navigation Ranging Units, Reels for Launching and Retrieving Units in Air and Water; Cathode Ray Data Displays; Graphic and Fiber Optic Recorders; Underwater Diver Detecting Apparatus for Detecting Submerged Objects: Underwater Cable Connectors; Underwater Television Cameras and Monitors; Seismic Recorders; Bathymetric Recorders; Airborne Video Gunsights and Cameras; Fuel Quantity Sensors; Underwater Drill Hole/Pipe Location and Reentry Units Using Acoustic and Video Transducers; Power Packs; Hydrofoil Vessel Gauging and Alignment Units; Flowmeter for Fluid Flow Measurement; Electrical Current Limiter Test Fixtures; Computer Controlled Electrical Testers for Computer Programmed Tests of Printed Circuit Boards; Video, Audio and Switch Test Fixtures for Sonar Systems Used for Antisubmarine Warfare; Installation Models of Cabinets and Wiring Harnesses for Use with Sonar Systems Radomes for Radar Antennas, Domes to Stream Line Under Water Acoustic Transducers