# Relationship history for MSHA mine 0103538

Current hierarchy: **Burke R Wakefield; Robert R Ryan → Southern Red Rock → Praco quarry**

- 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:** Burke R  Wakefield → Praco quarry; 2003-10-28 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert R Ryan et al → Praco quarry; 2017-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Red Rock → Praco quarry; 2020-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burke R  Wakefield → Southern Red Rock; 2020-01-13 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert R Ryan et al → Southern Red Rock; 2020-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burke R Wakefield et al → Southern Red Rock; 2020-01-13 to current/open; source msha-controller-operator-history