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Simeon Delchev Simeonov
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Mezhdunarodni organizat͡s︡ii po standartizat͡s︡ii͡a︡
Simeon Delchev Simeonov · Izd-vo "Standartizat͡s︡ii͡a︡"
101 sayfa · 1985
International Electrotechnical Commission / International Organization for Standardization / Standardization