# Relationship history for MSHA mine 3608454

Current hierarchy: **Shadle Darryl A → D J T Coal Company → D J T Slope**

- 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:** Ram Head Coal Company → D J T Slope; 1994-02-01 to 1996-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Brill Gary Et Al → D J T Slope; 1994-02-01 to 1996-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Brill Gary Et Al → Ram Head Coal Company; 1994-02-01 to 1996-06-03; source msha-controller-operator-history
- **operator_operates_mine:** D J T Coal Company → D J T Slope; 1996-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shadle Darryl A → D J T Slope; 1996-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shadle Darryl A → D J T Coal Company; 1996-06-04 to current/open; source msha-controller-operator-history