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Áþëåòèí Ðàöèîíàëèçàòîðñêè ïðåäëîæåíèÿ
ÐÀ401
Èíñòèòóò çà ðàöèîíàëèçàöèÿ
Ñîôèÿ
1957-1964
äðóãà
ISSN:
608.2:54+669
Èçîáðåòåíèÿ è ðàöèîíàëèçàöèè
Older Receipts (by Years):
1964; 1963; 1962; 1961; 1960; 1959; 1958; 1957
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