# Relationship history for MSHA mine 2302179

Current hierarchy: **Bernie  Bierman → Compton Pierson Development → Compton Pierson**

- 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:** Compton Pierson Development → Compton Pierson; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bernie  Bierman  et al → Compton Pierson; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Bierman  et al → Compton Pierson Development; 1998-10-01 to current/open; source msha-controller-operator-history