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GB1524761A
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Method of and apparatus formonitoring the level of material in a storage container
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US4064754A
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Method for measuring the filling level in containers and apparatus for performing the method
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NL7614143A
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Measurement of liq. level in container - uses float with magnetic follower in gas filled tube defining end point of measured optical path
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FR2360873A1
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Measurement of liq. level in container - uses float with magnetic follower in gas filled tube defining end point of measured optical path
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DE2630789A1
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Measurement of liq. level in container - uses float with magnetic follower in gas filled tube defining end point of measured optical path
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US4119900A
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Method and system for the automatic orientation and control of a robot
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CH591682A5
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Precision level meter for liq. - determines height of float by comparison of light beam reflected at its surface with reference beam
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GB1487360A
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Method of automatically orienting and controlling a vehicle
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DE1401866A1
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Radiant heater
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