# Relationship history for MSHA mine 2501143

Current hierarchy: **Scott  Ulrich; Wes  Ulrich → Ulrich Gravel Inc → FIALA 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:** Scott  Ulrich et al → FIALA PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ulrich Gravel Inc → FIALA PIT; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Ulrich et al → Ulrich Gravel Inc; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wes  Ulrich et al → Ulrich Gravel Inc; 1992-09-01 to current/open; source msha-controller-operator-history