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US3990815A
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Flow control device
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GB1489056A
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Installations for monitoring oil content
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DE2329259A1
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Valve control responding to electronic input signal - is used for regulating valve position by applying electric pulses of varying frequency
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GB1450534A
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Apparatus for supplying an incompressible fluid of a controlled rate
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Position regulating systems
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CA954204A
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Flame monitoring
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Classifying apparatus
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Flame monitoring
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Electrochemical analyzer for measuring the oxygen content of hot gases
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Improvements in apparatus for measuring the oxygen content of hot gases
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Improvements in or relating to pressure responsive devices
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Improvements in valve devices for protecting differential fluid pressure instruments
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Improvements in induction motor systems
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Improvements in transistor modulator circuits
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Improvements in or relating to transistor switching devices
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Improvements in apparatus for ascertaining the level of a surface of a body of liquid
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Improvements in or relating to means for the attenuation of ripple voltages in direct-current circuits
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Improvements in variable capacitance electrical information transmitting means and transmitting devices
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Improvements in or modifications of apparatus for detecting the presence or absence at a location of a body of material
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GB913302A
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Improvements in or relating to scanning switch systems
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