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Three-bolts equipment

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Three-bolts equipment with hand pump, from Naval Museum of Tallinn.

Three-bolts equipment, (Tryok'h'boltovoye snaryajzeniye, Трехболтовое снаряжение, трехболтовка) is a kind of a standard diving dress which was used by the Russian Navy in 19th and 20th centuries. This standard diving dress consists of an air-supplied metallic helmet that is strapped with water-protected suit by three bolts.

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