Telephone disk. Specifications
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Occupational safety standards system. Web teleprinters. Permissible levels of noise characteristics and its control methods
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Devices for speech reception and transmission. Methods of measuring acoustic noises
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Switch keys. Specifications
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Telephone push-button switches. Specifications
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Keyboard of telegraph apparatus. General technical requirements
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Baudot code start-stop apparatuses for alphabetic telegraphy
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Test table 0159K-12 for facsimile devices
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Facsimile devices. Reliability test methods
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Unified system of design documentation. Graphical symbols in diagrams. Telephone sets, switchboards and switching telephone exchanges
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Unified system of design documentation. Graphical conventions in diagrams. Apparatus and telegraph repeaters
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