# Relationship history for MSHA mine 0101980

Current hierarchy: **Berryhill Bill → Crimson Mining Inc → Porter 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:** Berryhill Bill → Porter Pit; 1978-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crimson Mining Inc → Porter Pit; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berryhill Bill → Crimson Mining Inc; 1978-12-01 to current/open; source msha-controller-operator-history