# Relationship history for MSHA mine 1002293

Current hierarchy: **Robert S Hall Jr; Robert S Hall Sr; Jeffrey P Hall → H & B Crushing LLC → Plant #4**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Steve  Dobson et al → Plant #4; 2003-11-13 to 2015-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey P Hall et al → Plant #4; 2015-12-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & B Crushing LLC → Plant #4; 2017-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Dobson et al → H & B Crushing LLC; 2017-08-17 to 2015-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Hall et al → H & B Crushing LLC; 2017-08-17 to 2015-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey P Hall et al → H & B Crushing LLC; 2017-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S Hall Jr et al → H & B Crushing LLC; 2017-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S Hall Sr et al → H & B Crushing LLC; 2017-08-17 to current/open; source msha-controller-operator-history