Patent classification

Human Necessities

B00:农林牧鱼;狩猎s B03:刷类制品 B00:焙烤;食用面团 B12:屠宰;肉品处理;家禽或鱼的加工

Performing Operations; Transporting

Chemistry; Metallurgy

Textiles; Paper

Fixed Constructions

Mechanical Engineering; Lighting; Heating; Weapons; Blasting

Physics

Electricity

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