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Hannunkari I, 1977, Z Gesamte Hyg, V23, P734
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HANSSON JE, 1973, SKOGSMASKINEN ARBETS, P9
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1975, TYOPAIKAN ILMAN EPAP
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1971, R1996 ISO INT ORG ST
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1973, T10773 NAT BOARD OCC
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1961, IEC123 INT EL COMM
[10]
1973, IEC179 INT EL COMM