# Relationship history for MSHA mine 0502963

Current hierarchy: **Starks R L & Bob → Starks Mining → C Bl 23**

- 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:** Mineral Reserves Group Inc → C Bl 23; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Energy Reserves Group Inc → C Bl 23; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Reserves Group Inc → Mineral Reserves Group Inc; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Starks R L & Bob → C Bl 23; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Starks Mining → C Bl 23; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Starks R L & Bob → Starks Mining; 1980-04-01 to current/open; source msha-controller-operator-history