Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B63
SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
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B63G
OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
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8/00
Underwater vessels, e.g. submarines;; Equipment specially adapted therefor
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B63G8/14
Control of attitude or depth
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B63G8/22
Adjustment of buoyancy by water ballasting; Emptying equipment for ballast tanks
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