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Pressure, Shock and Vibration Measuring Systems and Components, Comprising Accelerometers, Microphones, Strain Gages, Pressure and Force Transducers, Signal Conditioners, Electrical Power Supplies, Amplifiers, Electrical Switches, Shock Calibrators, Impact Sensors, Vibration Exciters, Oscillators, Electronic Memories, Cable Assemblies and Mounting Blocks and Studs for Mounting Accelerometers