Valve means for compressed air powered acoustic pulse generator

Vapor implosion in a closed flexible enclosure

Variable cylinder hydraulic vibrator and control system

Variable cylinder hydraulic vibrator and control system

Variable frequency vacuum actuated seismic energy source

Vehicle mounting and deployment arrangement for seismic source

Vehicle-carried vibrator for producing seismic vibrations

Vent means for closed air system impact-type seismic source

Vertical-force vibrator seismic wave source

Vibrating hole forming device for seismic exploration

Vibration generators

Vibrator baseplate

Vibrator for seismic geophysical prospecting

Vibrator hold-down plate

Vibrator mass actuator design

Vibrator systems for generating elastic waves in the earth

Vibrator tilt control system for vehicle mounted seismic vibrato

Vibratory apparatus for use in seismic exploration

Vibratory seismic source

Vibratory seismic source for generating combined compressional a