# Relationship history for MSHA mine 1001074

Current hierarchy: **Margaret  Riener → Rieners Crushing → Willemburg Pit**

- 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

- **operator_operates_mine:** Rieners Crushing → Willemburg Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rudolph J Riener → Willemburg Pit; 1950-01-01 to 2013-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Rudolph J Riener → Rieners Crushing; 1950-01-01 to 2013-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Margaret  Riener → Willemburg Pit; 2013-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret  Riener → Rieners Crushing; 2013-04-23 to current/open; source msha-controller-operator-history