# Relationship history for MSHA mine 1511032

Current hierarchy: **Murphy Ronald D → Murphy Elkhorn Coal Company Inc → No 2 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

- **controller_controls_mine:** United  Company → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** International Minerals & Chemical Corp → No 2 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Industries Inc → No 2 Mine; 1977-11-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_operator:** International Minerals & Chemical Corp → Crescent Industries Inc; 1977-11-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Murphy Ronald D → No 2 Mine; 1982-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 2 Mine; 1983-03-01 to 1984-06-27; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1983-03-01 to 1984-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Coal Bucket Mining Inc → No 2 Mine; 1984-06-28 to 1986-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Griffith Bob → No 2 Mine; 1984-06-28 to 1986-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Griffith Bob → Coal Bucket Mining Inc; 1984-06-28 to 1986-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 2 Mine; 1986-06-17 to 1986-07-09; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1986-06-17 to 1986-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Murphy Elkhorn Coal Company Inc → No 2 Mine; 1986-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murphy Ronald D → Murphy Elkhorn Coal Company Inc; 1986-07-10 to current/open; source msha-controller-operator-history