# Relationship history for MSHA mine 1503733

Current hierarchy: **Coleman Branson → Ike Coal Company Inc → No 7-C**

- 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:** Richard Coal Company → No 7-C; 1950-01-01 to 1972-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Thelma G & Kerry → No 7-C; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Thelma G & Kerry → Richard Coal Company; 1950-01-01 to 1972-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Branson → No 7-C; 1972-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shell Coal Company → No 7-C; 1972-10-01 to 1973-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Hunt James E → No 7-C; 1972-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunt James E → Shell Coal Company; 1972-10-01 to 1973-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Ike Coal Company Inc → No 7-C; 1973-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Branson → Ike Coal Company Inc; 1973-09-11 to current/open; source msha-controller-operator-history