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Sampler
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Process for hydrothermal preparation of bismuth oxide and group iy element
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Depth sampler
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Water sampler
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Periodic oscillation generator
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Device for measuring temperature
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Infralow frequency generator
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Parallel code-to-voltage converter
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Parallel code-to-voltage converter
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Hydrostatic geodetic level
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Method of detecting underwater volcanoes and hydrothermal sources
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Device for digital magnetic recording in binary-coded decimal code
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Parallel code/voltage converter
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Geothermal survey method
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Contact-free current-and-voltage regulator
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Quartz time-piece
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