VACUUM TUBE
A class with identifier
http://staging4.data.posccaesar.org/iso/15926-4/rdl/RDS987209
| Definition | A <VACUUM TUBE> is an <ELECTRONIC TUBE> evacuated to such a degree that its electric characteristics are essentially unaffected by the ionization of any residual vapour or gas | 
| ISO number | 3594 | 
| RDS number | RDS987209 | 
| Source | IEV 151-13-61 | 
| Electrical |