Printed circuit boards. Basic dimensions
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Alternating resistors. Range of rated resistance
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Electro-vacuum devices with a solid incandescent cathode. Ranges of voltage of lamp and anode
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Resistors, constant. Ranges of rated resistance
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Artificial line for testing of field telephone batteries of local telephone systems
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Wired communication power supply. Voltages
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Wired communication power supply. Voltages
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Protection of wireline communication installations from dangerous voltages and currents arising on communication lines. Rules, schemes and regulations
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Protection of wireline communication installations from dangerous voltages and currents arising on communication lines. Rules, schemes and regulations
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Intersections of wires of communication lines and wires of radio transmission lines with wires of contact networks of electrified railways, trams, trolleybuses. Specification
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