# Relationship history for MSHA mine 4402699

Current hierarchy: **Smith Roger → Rogers Coal Co Inc → No 2 Mine**

- 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:** Thacker Coal Co → No 2 Mine; 1950-01-01 to 1973-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Thacker Coal Co → No 2 Mine; 1950-01-01 to 1973-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Thacker Coal Co → Thacker Coal Co; 1950-01-01 to 1973-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Black Coal Co → No 2 Mine; 1973-01-01 to 1976-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Coal Co → No 2 Mine; 1973-08-01 to 1974-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Black Coal Co → Black Coal Co; 1973-08-01 to 1974-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Coal Co Inc → No 2 Mine; 1974-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Roger → No 2 Mine; 1974-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Roger → Rogers Coal Co Inc; 1974-04-21 to current/open; source msha-controller-operator-history