Rīgas eksperimentālās rūpnīcas "Etalons" galvenais inženieris N. Ļvovs un montāžas ceha darbinieks N. Vasiļjevs. Darba process sviru svaru montāžas iecirknī.
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Latvijas Nacionālais arhīvs. Latvijas Valsts kinofotofonodokumentu arhīvs
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