# Relationship history for MSHA mine 1516030

Current hierarchy: **Drinnon Nathan → D & S Coal Company → 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:** J B D Mining Company Inc → No 1; 1987-05-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Davis Jefferson B → No 1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Jefferson B → J B D Mining Company Inc; 1987-05-01 to 1989-10-01; source msha-controller-operator-history
- **operator_operates_mine:** West-John Inc → No 1; 1989-10-02 to 1990-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Allen Roy → No 1; 1989-10-02 to 1990-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Allen Roy → West-John Inc; 1989-10-02 to 1990-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Stu Coal Inc → No 1; 1990-02-23 to 1990-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Stewart → No 1; 1990-02-23 to 1990-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Stewart → Stu Coal Inc; 1990-02-23 to 1990-07-24; source msha-controller-operator-history
- **operator_operates_mine:** D & S Coal Company → No 1; 1990-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Drinnon Nathan Et Al → No 1; 1990-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drinnon Nathan Et Al → D & S Coal Company; 1990-07-25 to current/open; source msha-controller-operator-history