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Keyboard of telegraph apparatus. General technical requirements
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Keyboard of telegraph apparatus. General technical requirements
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Keyboard of telegraph apparatus. General technical requirements
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Facsimile apparatus. The main parameters
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Facsimile devices. The main parameters
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Equipment for tonal wiring with frequency modulation. Basic electrical parameters
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Equipment for tonal wiring with frequency modulation. The main parameters
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The telegraph equipment letter-printing with five-element code. Fonts for keyboards. Basic dimensions
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Unified automated country communication system. Channels of acoustic telegraphy with frequency modulation. Types and basic electric parameters
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Printing teletypes for 5-elements code. Fonts. Symbols size and his contour
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