# Relationship history for MSHA mine 4604522

Current hierarchy: **Cardwell Robert G → Mogasco Mining Inc → No 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:** Marquard & Bahls Ag → No 2; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carter-Roag Coal Company → No 2; 1975-03-01 to 1979-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Marquard & Bahls Ag → Carter-Roag Coal Company; 1975-03-01 to 1979-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Mogasco Mining Inc → No 2; 1979-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cardwell Robert G → No 2; 1979-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cardwell Robert G → Mogasco Mining Inc; 1979-05-18 to current/open; source msha-controller-operator-history