URI
Notation
621.5
Caption
Pneumatic energy, machinery and tools. Refrigeration
Including
Compression and rarefaction equipment. Wind power machines (wind turbines, windmills etc). Refrigeration technology. Production of low temperatures (cryogenics)
Application Note
For details of machinery and processes use special auxiliary numbers 62-1/-9
See also
66.07Chemical technology of gases
661.9Production of gases
Broader class
621  Mechanical engineering in general. Nuclear technology. Electrical engineering. Machinery