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PL347790A1
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Method of determining equilibrium conditions of the atmosphere
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PL344616A1
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Method of estimating surface emission of air pollutants in urban areas
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PL312056A1
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Method of making movable antiflooding embankments
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PL295189A1
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Apparatus for measuring flowing water filtration
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PL293501A1
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Off-side winch
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PL290654A1
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Method of completely biologically treating waste waters using biological beds
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PL283866A1
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Fluorometric probe
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PL246161A1
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Hydrometric mill
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PL246160A1
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Method of and apparatus for measuring stresses or strains in engineering structures
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PL242345A1
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Method of determination of frequency spectrum of the waveform of limited frequency band
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PL238679A1
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Method of improvement of resistance of phase-sensitive loop against falling out of step and apparatus therefor
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PL237241A1
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Apparatus for measurement of components of wind velocity
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PL237242A1
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Automatic weather station
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