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International virtual journal "Machines, Technologies, Materials"
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Scientific-Technical Union of Mechanical Engineering
Bulgaria, 1000 Sofia, 108 Rakovsky Str.
tel.: (+0359 2) 987 72 90, 986 22 40; fax: (+359 2) 986 22 40,
E-mail: nts-bg@mech-ing, .com, nts_bg@mail.bg; www.mech-ing.com
Skype: NTSMashinostroene
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