# Relationship history for MSHA mine 4403860

Current hierarchy: **Lester Donald R → Carol Coal Corp → 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:** Smith Branch Coal Company Inc → No 2 Mine; 1974-01-01 to 1987-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Charles Warren → No 2 Mine; 1974-01-01 to 1987-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Charles Warren → Smith Branch Coal Company Inc; 1974-01-01 to 1987-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Lester Donald R → No 2 Mine; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Hersel E → No 2 Mine; 1982-02-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yogi Mining Company Inc → No 2 Mine; 1987-08-06 to 1989-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Potter Hersel E → Yogi Mining Company Inc; 1987-08-06 to 1989-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Smith Glen A → No 2 Mine; 1988-04-18 to 1990-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Iron Head Mining Inc → No 2 Mine; 1989-03-22 to 1990-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Smith Glen A → Iron Head Mining Inc; 1989-03-22 to 1990-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Carol Coal Corp → No 2 Mine; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Donald R → Carol Coal Corp; 1990-09-11 to current/open; source msha-controller-operator-history