ZA75690B - Device for controlling the level of a liquid emitting infra-red rays and, in particular, the level of molten metal in appropriate containers
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Device for controlling the level of a liquid emitting infra-red rays and, in particular, the level of molten metal in appropriate containers
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ZA00750690A1974-09-261975-02-03Device for controlling the level of a liquid emitting infra-red rays and, in particular, the level of molten metal in appropriate containers
ZA75690B
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