Oscillator, modulator and regulation tubes with anode dissipated power above 25 W. Methods of cut-off voltage (bias), trans. Conductance and amplification factor measurements
Safety of household and similar electrical appliances. Part 2-55. Particular requirements for electrical appliances for use with aquariums and garden ponds
State system for ensuring the uniformity of measurements. Measuring instruments of artificial radioactive aerosols volumetric activity. Verification procedure
€10
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