| CIPM: | International Committee for Weights and Measures |
| BIPM: | International Bureau of Weights and Measures |
| IEC: | International Electrotechnical Commission |
| ISO: | International Organization for Standardization |
| OIML: | International Organization of Legal Metrology |
| * | These dates have been corrected from those in
the first (1993) edition of TN 1297 and in the Guide. |