| 2021-08-26 | Measure of conductance |
| 2017-11-20 | Unit of conductance |
| 2015-03-18 | Former conductance unit |
| 2014-12-18 | Former name of the physics unit siemens |
| 2014-03-11 | Unit of electrical conductance |
| 2013-09-01 | Electrical unit, old-style |
| 2013-04-02 | Old electrical unit |
| 2012-11-14 | Old unit of conductance |
| 2011-12-21 | Unit now known as a siemens |
| 2011-09-15 | Conductance unit |
| 2011-01-11 | Measure of conductance |
| 2010-01-10 | Conductance unit |
| 2008-12-14 | Conductance unit |
| 2007-04-07 | Unit of conductance |
| 2007-01-02 | Conductance unit |
| 2001-11-10 | Unit of conductance |
| 2001-01-07 | Measure of conductance |
| 2000-11-30 | Measure of conductance |
| 1999-12-13 | Unit of conductance |
| 1994-10-29 | Conductance unit |