Valsts valodas centra izstrādātie transporta, infrastruktūras un sakaru termini

Konteksts: [..] 50 kHz pulse frequency [..]
Avots: Commission Decision of 30 May 2002 concerning the technical specification for interoperability relating to the control-command and signalling subsystem of the trans-European high-speed rail system referred to in Article 6(1) of Council Directive 96/48/EC(notified under document number C(2002) 1947) (Text with EEA relevance) (2002/731/EC)