Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz. Part 2-3. Immunity requirements for mains communications equipment and systems operating in the range of frequencies 3 kHz to 95 kHz intended for use by electricity suppliers and distributors
Destructive tests on welds in metallic materials. Hardness testing of narrow joints welded by laser and electron beam (Vickers and Knoop hardness tests)
€10
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