DIFF Subgroup
F25B 21/02 using Peltier effect; using Nernst-Ettinghausen effect
Introduced: September 1968
Full Title
Machines, plants or systems, using electric or magnetic effects > using Peltier effect; using Nernst-Ettinghausen effect
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1990.
Child Classifications
Navigate with arrow keys, Enter to open