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| More topics under "F25 - Refrigeration or cooling; Combined heating and refrigeration systems; Heat pump systems; Manufacture or storage of ice; Liquefaction or solidification of gases" (270,567) |
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| F25B - Refrigeration machines, plants, or systems; Combined heating and refrigeration systems; Heat pump systems (142,015) | | F25C - Production, working, storing or distribution of ice (12,704) | | F25D - Refrigerators; Cold rooms; Ice-boxes; Cooling or freezing apparatus not covered by any other subclass (99,512) | | F25J - Liquefaction, solidification, or separation of gases or gaseous mixtures by pressure and cold treatment (16,336) |
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