Russian standards PDF
Single-sideband modulation radio stations of marine mobile service. Types, basic parameters, technical requirement and methods of measurement
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Polypropylene and copolymers of propylene. Specifications
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Metallic and non-metallic inorganic coatings of bicycles, motor cycles, scooters, motorbicycles. General requirements and methods of control
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Short-circuits in electrical installations. Calculation methods in d.c. electrical
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