Method and apparatus for seismic exploration using non-linear sweeps
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Vibrator response linearization circuit
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Reaction mass acceleration feedback device
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Method and apparatus for analysing geophones
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Connector with selectable internal electrical connections.
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Connector for use in seismic exploration - has dual dia plugs and sockets inside ribbed insulating seals
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Connector with terminals at ends of electric cable - has snap-on terminal protecting closure member held captive via, pref. polyurethane, element with lower tensile strength than cable
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Well tool locking apparatus
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Lateral compliance device for geophone springs
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Apparatus for fiber optic seismic exploration system
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Delta-shaped geophone spring
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Automatic force control for a seismic vibrator
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Method and apparatus for multi-line seismic exploration
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Method and apparatus for seismic exploration using nonlinear sweeps
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Fuel oil injection engine
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Geophone with stationary coil and moving permanent magnet - mounted on spring bushes and polarisable according to direction of vibrations expected
