F - MECHANICAL ENGINEERING
F17 - STORING OR DISTRIBUTING GASES OR LIQUIDS
F17C - VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES
G - PHYSICS
G01 - MEASURING
G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
F - MECHANICAL ENGINEERING
F17 - STORING OR DISTRIBUTING GASES OR LIQUIDS
F17C - VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES
F17C13/02 - Special adaptations of indicating, measuring, or monitoring equipment
F17C2201/0109 - with exteriorly curved end-piece
F17C2205/0326 - electrically actuated
F17C2221/011 - Oxygen
F17C2221/014 - Nitrogen
F17C2223/0161 - cryogenic, e.g. LNG, GNL, PLNG
F17C2223/033 - Small pressure, e.g. for liquefied gas
F17C2250/0417 - with electrical means
F17C2250/061 - Level of content in the vessel
F17C2250/072 - Action when predefined value is reached
G - PHYSICS
G01 - MEASURING
G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
G01F23/247 - {for discrete levels}
Y - NEW / CROSS SECTIONAL TECHNOLOGIES
Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T137/7306 - Electrical characteristic sensing