# Relationship history for MSHA mine 4403800

Current hierarchy: **Dotson Dexter → Deena Coal Company Inc → No 1 Strip**

- 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:** Deena Coal Company → No 1 Strip; 1974-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Chester Avis → No 1 Strip; 1974-01-01 to 1976-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Chester Avis → Deena Coal Company; 1974-01-01 to 1976-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Deena Coal Company Inc → No 1 Strip; 1976-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dotson Dexter → No 1 Strip; 1976-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Dexter → Deena Coal Company Inc; 1976-09-21 to current/open; source msha-controller-operator-history