# Relationship history for MSHA mine 1507192

Current hierarchy: **Linder John → D F J Coal Company Inc → No 4 Mine**

- 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:** D J D Coal Company → No 4 Mine; 1974-01-01 to 1974-08-26; source msha-controller-operator-history
- **controller_controls_mine:** D J D Coal Company → No 4 Mine; 1974-01-01 to 1974-08-26; source msha-controller-operator-history
- **controller_controls_operator:** D J D Coal Company → D J D Coal Company; 1974-01-01 to 1974-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Vance & Couch Coal Company → No 4 Mine; 1974-08-27 to 1978-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Couch George → No 4 Mine; 1974-08-27 to 1978-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Couch George → Vance & Couch Coal Company; 1974-08-27 to 1978-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Linder John → No 4 Mine; 1978-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company → No 4 Mine; 1978-10-06 to 1979-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Brown Edward A & Gary Bentley → No 4 Mine; 1978-10-06 to 1979-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Brown Edward A & Gary Bentley → B & B Coal Company; 1978-10-06 to 1979-03-08; source msha-controller-operator-history
- **operator_operates_mine:** D F J Coal Company Inc → No 4 Mine; 1979-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linder John → D F J Coal Company Inc; 1979-03-09 to current/open; source msha-controller-operator-history