| 1/00 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) |
| 1/01 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric |
| 1/02 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric for comparing analogue signals |
| 1/03 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric for comparing digital signals |
| 1/04 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric with sensing of the position of the pointer of a measuring instrument |
| 1/06 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric with sensing of the position of the pointer of a measuring instrument continuous sensing |
| 1/08 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) electric with sensing of the position of the pointer of a measuring instrument stepwise sensing |
| 1/11 | Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals H03D 13/00) fluidic |
| 5/00 | Anti-hunting arrangements |
| 5/01 | Anti-hunting arrangements electric |
| 5/04 | Anti-hunting arrangements fluidic |
| 6/00 | Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral, differential (in automatic controllers G05B 11/00) |
| 6/02 | Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral, differential (in automatic controllers G05B 11/00) electric |
| 6/05 | Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral, differential (in automatic controllers G05B 11/00) fluidic |
| 7/00 | Arrangements for obtaining smooth engagement or disengagement of automatic control |
| 7/02 | Arrangements for obtaining smooth engagement or disengagement of automatic control electric |
| 7/04 | Arrangements for obtaining smooth engagement or disengagement of automatic control fluidic |
| 9/00 | Safety arrangements (G05B 7/00 takes precedence; safety arrangements in programme-control systems G05B 19/048, G05B 19/406; safety valves F16K 17/00; emergency protective circuit arrangements in general H02H) |
| 9/02 | Safety arrangements (G05B 7/00 takes precedence; safety arrangements in programme-control systems G05B 19/048, G05B 19/406; safety valves F16K 17/00; emergency protective circuit arrangements in general H02H) electric |
| 9/03 | Safety arrangements (G05B 7/00 takes precedence; safety arrangements in programme-control systems G05B 19/048, G05B 19/406; safety valves F16K 17/00; emergency protective circuit arrangements in general H02H) electric with multiple-channel loop, i.e. redundant control systems |