# Relationship history for MSHA mine 4405903

Current hierarchy: **Richardson Dowell → Cody Coal Inc → No 1**

- 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:** Hokie Coal Company Inc → No 1; 1982-06-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → No 1; 1982-06-01 to 1984-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Hokie Coal Company Inc; 1982-06-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Altizer Emory R → No 1; 1983-05-15 to 1983-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Emcoal Mining Inc → No 1; 1983-05-16 to 1983-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Altizer Emory R → Emcoal Mining Inc; 1983-05-16 to 1983-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Hokie Coal Company Inc → No 1; 1983-09-19 to 1984-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Hokie Coal Company Inc; 1983-09-19 to 1984-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Bar-V Mining Inc → No 1; 1984-08-24 to 1985-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Vandyke James O → No 1; 1984-08-24 to 1985-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Vandyke James O → Bar-V Mining Inc; 1984-08-24 to 1985-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Cody Coal Inc → No 1; 1985-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → No 1; 1985-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Cody Coal Inc; 1985-09-05 to current/open; source msha-controller-operator-history