# Relationship history for MSHA mine 4404444

Current hierarchy: **Vance Clell P → Black Energy Coal Company Inc → No 1 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:** Kennedy Coal Corp → No 1 Mine; 1976-04-01 to 1977-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Raymond → No 1 Mine; 1976-04-01 to 1981-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Raymond → Kennedy Coal Corp; 1976-04-01 to 1977-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Ryder Coal Company Inc → No 1 Mine; 1977-03-02 to 1979-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → No 1 Mine; 1977-03-02 to 1979-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Ryder Coal Company Inc; 1977-03-02 to 1979-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Black Energy Coal Company Inc → No 1 Mine; 1979-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vance Clell P Et Al → No 1 Mine; 1979-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vance Clell P Et Al → Black Energy Coal Company Inc; 1979-08-07 to current/open; source msha-controller-operator-history