DIFF Subgroup
F25J 1/02 requiring the use of refrigeration, e.g. of helium or hydrogen
Introduced: September 1968
Full Title
Processes or apparatus for liquefying or solidifying gases or gaseous mixtures > requiring the use of refrigeration, e.g. of helium or hydrogen
Of 7 combined children, 0 exist in both systems.
7 codes are CPC-only extensions.
Child Classifications
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