Bulgarian National Acoustics NSA
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President: Ivan Valtchev Audio Research Laboratory 43 Dondukov St. BG-1000 Sofia, Bulgaria Tel.: +359 (0)29 899 622 Mail: Secretariat: Georgi Koulichev G. K. Engineering & Production 14-16 Tzanko Tzerkovski St. BG-1421 Sofia, Bulgaria Tel.: +359 (0)2 661 595 Mail: |
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