This was before the development of the membrane technology that is used for liquid nitrogen generation today.
Gifford McMahon Cycle
Presented: Cryogenic Engineering Conference, Rice University – 1965
By: William E. Gifford
Pulse Tube Refrigeration Progress
Presented: Cryogenic Engineering Conference, University of Pennsylvania- 1964
By: William E. Gifford and R. C. Longsworth
Published: International Advances in Cryogenic Engineering- Volume 10- 1964
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