Underwater detecting apparatus, depth measuring apparatus...
Underwater generation of low frequency sound
Underwater seismic source
Underwater seismic testing
Underwater shear wave vibrator coupling
Underwater sound generator
Underwater sound mitigation system for explosive testing
Underwater voice communicator
Underwater voice communicator
Unidirectional enhancer for microphones
Unidirectional speaker enclosure
Unitary anti-skid vibration dampening structure
Unitary elastic muffler assembly for a pneumatic device
Unitary tuned port and loudspeaker frame
Universal heat shield
Universal muffler assembly
Universal muffler construction assembly
Use for a seismic energy pulse generator for generating and shap
Use of a material with a high internal damping for a...
Use of autonomous moveable obstructions as seismic sources