# Relationship history for MSHA mine 0101041

Current hierarchy: **Calvert John D → Calvert & Marsh Coal Company Inc → Cleveland 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:** Calvert John D → Cleveland Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mark Coal Co → Cleveland Pit; 1950-01-01 to 1975-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Osborn C O & Mark Osborn → Cleveland Pit; 1950-01-01 to 1975-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Osborn C O & Mark Osborn → Mark Coal Co; 1950-01-01 to 1975-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Calvert & Marsh Coal Company Inc → Cleveland Pit; 1975-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calvert John D → Calvert & Marsh Coal Company Inc; 1975-12-17 to current/open; source msha-controller-operator-history