# Relationship history for MSHA mine 2500888

Current hierarchy: **Scott  Ulrich; Wes  Ulrich → Ulrich Gravel Inc → Ulrich 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

- **controller_controls_mine:** Wes  Ulrich et al → Ulrich Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bresley Inc → Ulrich Pit; 1950-01-01 to 1979-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Bresley Dean → Ulrich Pit; 1950-01-01 to 1979-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Bresley Dean → Bresley Inc; 1950-01-01 to 1979-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Ulrich Gravel Inc → Ulrich Pit; 1979-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wes  Ulrich et al → Ulrich Gravel Inc; 1979-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Ulrich et al → Ulrich Gravel Inc; 1979-04-05 to current/open; source msha-controller-operator-history