# Relationship history for MSHA mine 0504742

Current hierarchy: **Eric J Frei → Flag Resources Inc. → Pit 2**

- 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:** Fred  Frei → Pit 2; 1991-06-20 to 2025-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Flag Resources Inc. → Pit 2; 2002-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Frei → Flag Resources Inc.; 2002-03-11 to 2025-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Eric J Frei → Pit 2; 2025-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric J Frei → Flag Resources Inc.; 2025-05-13 to current/open; source msha-controller-operator-history