# Relationship history for MSHA mine 1504311

Current hierarchy: **Hamilton J Byron → Hamilton Coal Company Inc → Old Circle M-50**

- 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:** Anthony  Newsome → Old Circle M-50; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hamilton Coal Company Inc → Old Circle M-50; 1950-01-01 to 1980-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton J Byron → Old Circle M-50; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton J Byron → Hamilton Coal Company Inc; 1950-01-01 to 1980-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Newsome Coal Company → Old Circle M-50; 1980-08-07 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  Newsome → Newsome Coal Company; 1980-08-07 to 1983-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Hamilton Coal Company Inc → Old Circle M-50; 1983-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton J Byron → Hamilton Coal Company Inc; 1983-05-16 to current/open; source msha-controller-operator-history