# Relationship history for MSHA mine 4403770

Current hierarchy: **Stanley John B → J R & R Coal Company Inc → Mine #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

- **operator_operates_mine:** E S & S Coal Corp → Mine #4; 1974-12-01 to 1975-08-12; source msha-controller-operator-history
- **controller_controls_mine:** E S & S Coal Corp → Mine #4; 1974-12-01 to 1975-08-12; source msha-controller-operator-history
- **controller_controls_operator:** E S & S Coal Corp → E S & S Coal Corp; 1974-12-01 to 1975-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Minco Corp & Westbury Development Corp → Mine #4; 1975-04-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Westbury Coal Mining Partnership → Mine #4; 1975-08-13 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Minco Corp & Westbury Development Corp → Westbury Coal Mining Partnership; 1975-08-13 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Westbury Coal Mining Partnership → Mine #4; 1980-01-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Seaboard Coal Mining Corp → Mine #4; 1980-01-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Seaboard Coal Mining Corp → Westbury Coal Mining Partnership; 1980-01-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Stanley John B → Mine #4; 1982-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J R & R Coal Company Inc → Mine #4; 1987-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley John B → J R & R Coal Company Inc; 1987-06-18 to current/open; source msha-controller-operator-history