# Relationship history for MSHA mine 4603331

Current hierarchy: **Mason Martin E → Briar Branch Mining Company Inc → No 1 Surface**

- 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:** Eagle Coal & Dock Company Inc → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & T Coal Corp → No 1 Surface; 1950-01-01 to 1977-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Codd Philip R → No 1 Surface; 1950-01-01 to 1977-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Codd Philip R → M & T Coal Corp; 1950-01-01 to 1977-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Coal & Dock Company Inc → No 1 Surface; 1977-05-24 to 1978-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Coal & Dock Company Inc → Eagle Coal & Dock Company Inc; 1977-05-24 to 1978-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Monclo Mining Inc → No 1 Surface; 1978-09-21 to 1979-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Sullivan Paul E → No 1 Surface; 1978-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sullivan Paul E → Monclo Mining Inc; 1978-09-21 to 1979-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Briar Branch Mining Company Inc → No 1 Surface; 1979-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mason Martin E → No 1 Surface; 1979-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mason Martin E → Briar Branch Mining Company Inc; 1979-08-23 to current/open; source msha-controller-operator-history