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Spectrum = gas discharge tubes: the noble gases: helium He, neon Ne, argon Ar, krypton Kr, xenon Xe. Used with 1,8kV, 18mA, 35kHz. ≈8″ length. (Photo credit: Wikipedia) Se vor ieftini vreodată?În veci… http://www.business24.ro/preturi/stiri-preturi/gazele-se-vor-scumpi-cu-7-la-suta-in-acest-an-nu-se-stie-insa-de-la-ce-data-1554527