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