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US3800941A
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Can sorter
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Null loop for correcting low frequency error signals in high performance amplifiers
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Conveyer guide
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Digital sweep generator for generating analog signals
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Sorting machine
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Digital phase-correcting servo for controlling the phase of an analog drive signal
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Container-packing apparatus
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Marine seismic source employing the water-hammer effect
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Gas operated seismic source employing an inflatable member
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Processing apparatus for objects
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Seismometer spring
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Dual magnetic circuit low leakage geophone
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Air operated underwater seismic source
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Solid state electronic memory system for sorting machines
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Processing apparatus for objects
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Seismic data time varying time scale display and process
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Apparatus for molding improved bulkheads for seismic streamers and the like
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GB1241826A
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Improvements in or relating to storage apparatus for magnetic tape
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Continuous waveform presentations in time-shared systems
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Defect detector with rotating scanner
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