# Relationship history for MSHA mine 3607722

Current hierarchy: **Brown David & Allen Deeter → D & B Coal Company → D&B 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:** Ronald Donton Coal Company → D&B Slope; 1985-08-01 to 1989-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Donton Ronald Et Al → D&B Slope; 1985-08-01 to 1989-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Donton Ronald Et Al → Ronald Donton Coal Company; 1985-08-01 to 1989-08-24; source msha-controller-operator-history
- **operator_operates_mine:** D & B Coal Company → D&B Slope; 1989-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown David & Allen Deeter → D&B Slope; 1989-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown David & Allen Deeter → D & B Coal Company; 1989-08-25 to current/open; source msha-controller-operator-history