# Relationship history for MSHA mine 4404504

Current hierarchy: **Corbin Eugene  Cline → Triangle Coal Company → No 4**

- 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

- **controller_controls_mine:** Dotson Rail & Dexter → No 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dotson Bobby & James Little → No 4; 1975-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Estil & Curtis Justus Jr → No 4; 1975-11-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & D Coal Company → No 4; 1976-07-01 to 1976-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Rail & Dexter → R & D Coal Company; 1976-07-01 to 1976-10-25; source msha-controller-operator-history
- **operator_operates_mine:** M & J Coal Company → No 4; 1976-10-26 to 1977-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Estil & Curtis Justus Jr → M & J Coal Company; 1976-10-26 to 1977-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Cisco Coal Company → No 4; 1977-03-26 to 1978-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Cisco Thomas Jr → No 4; 1977-03-26 to 1978-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Cisco Thomas Jr → Cisco Coal Company; 1977-03-26 to 1978-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Coal Company → No 4; 1978-02-24 to 1978-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Bobby & James Little → Triangle Coal Company; 1978-02-24 to 1978-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Coal Company → No 4; 1978-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Corbin Eugene  Cline et al → No 4; 1978-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corbin Eugene  Cline et al → Triangle Coal Company; 1978-05-26 to current/open; source msha-controller-operator-history