3510 Transformers and choke coils general
3513 Measuring, separate and instrument transformers
3515 Power semiconductor converters and rectifiers
3516 Power semiconductor parts
3517 Thyristor drives
3519 Magnetically soft alloys transformers sheets
3530 Electrical apparatus, general
3534 Electrical double-stage relays
3538 High-frequency connectors
3540 Tests of constructional parts for electronics
3513 Measuring, separate and instrument transformers
3515 Power semiconductor converters and rectifiers
3516 Power semiconductor parts
3517 Thyristor drives
3519 Magnetically soft alloys transformers sheets
3530 Electrical apparatus, general
3534 Electrical double-stage relays
3538 High-frequency connectors
3540 Tests of constructional parts for electronics
3541 L,T power switchgear
3542 H,T, and E,H,T, power switchgear
3545 Sockets and plugs
3546 Communication sockets and plugs, connectors
3547 L,T and H,T, cutest
3548 Overvoltage arresters
3561 Consumption meters
3562 Electrical measuring instruments
3565 Electrical measuring instruments, incl. nuclear technics
3566 Instruments for nuclear technics
3542 H,T, and E,H,T, power switchgear
3545 Sockets and plugs
3546 Communication sockets and plugs, connectors
3547 L,T and H,T, cutest
3548 Overvoltage arresters
3561 Consumption meters
3562 Electrical measuring instruments
3565 Electrical measuring instruments, incl. nuclear technics
3566 Instruments for nuclear technics
3580 Passive electronic components
3581 Resistors, thermistors, potentiometers
3582 Capacitors
3584 Piezoelectric components and ferrite cores
3585 Electron tubes and cathode-ray tubes
3587 Semiconductor elements
3588 Optical fibre selector and optical fibres
3590 Printed wiring
3592 Cables and elements for fibre optics
3593 Surface mounting technology
3581 Resistors, thermistors, potentiometers
3582 Capacitors
3584 Piezoelectric components and ferrite cores
3585 Electron tubes and cathode-ray tubes
3587 Semiconductor elements
3588 Optical fibre selector and optical fibres
3590 Printed wiring
3592 Cables and elements for fibre optics
3593 Surface mounting technology