# Relationship history for MSHA mine 1512622

Current hierarchy: **Costain Group PLC → Costain Coal Inc → Edro**

- 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:** Costain Group PLC → Edro; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Jim R → Edro; 1974-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jim Smith Contracting Company Inc → Edro; 1980-10-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Smith Jim R → Jim Smith Contracting Company Inc; 1980-10-01 to 1986-05-31; source msha-controller-operator-history
- **operator_operates_mine:** J Smith Coal Inc → Edro; 1986-06-01 to 1988-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Smith Jim R & Larry Finley → Edro; 1986-06-01 to 1988-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Smith Jim R & Larry Finley → J Smith Coal Inc; 1986-06-01 to 1988-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Southard Coal Inc → Edro; 1988-05-18 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Pyro Energy Corp → Edro; 1988-05-18 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Pyro Energy Corp → Southard Coal Inc; 1988-05-18 to 1989-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Costain Coal Inc → Edro; 1989-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Costain Coal Inc; 1989-08-01 to current/open; source msha-controller-operator-history